The picture above is basically a “Colt c*#k block”. It is a sear block that was installed by the Colt factory. This was Colt’s answer to prevent people from using DIAS (Drop In Auto Sear) or a Lightning Link back when they were plentiful and affordable prior to 1986. They even neutered the BCG so it can’t trip a full auto sear. Where is the fun in that?



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  • R

    Thanks. I’ve heard people reference this, but had never seen an examble before.

  • Rick O’Shay

    It still looks like it has a third hole? Am I seeing things?

    • Anonymoose

      That’s to hole the block in.

      • DJ9r

        Yep, and it’s blind pin that only goes in from one side (has no hole on the other side to push it out). IIRC, it was installed as a press-fit with a multi-ton press, so it’s a super-tight fit with the hole in the sear block itself. That’s why folks cut the block into pieces to remove it; despite being a pain, it’s still the easiest way to do it without potentially damaging the receiver.

    • Glenn Bellamy

      The “third hole” is not in the right location, which would make it even more difficult to remove the block and drill a hole in the right place.

      • Gary Kirk

        It’s just a bit to the rear of where a sear pin would be located.. And if I remember correctly, it’s more of a pin “plug welded” in.. So if you tried to remove it and drill the correct hole. It wouldn’t work anyway because the sear pin would work backwards and malfunction the entire FCG.. Plus you’d have to machine out the shoulder on the right side of the trigger well, and machine the depth to the correct location..

  • guns2317

    I have one of these older Colts. That block is a PITA and yes, there is a pin that is flush holding the assembly in the frame.

    • RICH

      That ‘pin’ is right about where the pin is for the full auto m16/m4 ! Just sayin’…..!

      • James Clark

        that “pin” is nowhere near the right size for an auto sear pin.

        • RICH

          I DIDN’T SAY IT WAS THE “RIGHT SIZE” JAMES, I SAID IT WAS IN THE CORRECT LOCATION. THE CORRECT SIZE IS 0.154″ OR 0.169″, DEPENDENT ON IF THE RECEIVER WAS MANUFACTURED PRIOR OR POST 1969. JUST SAYIN’……..

  • Ken

    Don’t forget that they also had the receiver pins and the fire control pins oversized to prevent you from using mil-spec stuff.

    • alex archuleta

      I always wondered why Colt did that.
      This is the reason why I love this blog. The writers and especially the readers are some incredibly knowledgeable people!

      • anon

        Colt did that because colt was and probably still is the actual “you suck and we hate you” company. They had no care for gun rights, or civilian sales for that matter, as long as they could get that sweet sweet govt money from m16/m4 contracts. I would hate to see Colt go, but they deserve everything that comes to them.

        • Some Rabbit

          They thought that would buy them an exemption when the ban went into effect. Silly Colt.

      • Pumpkin King XXIII

        Is that why they did that? I always figured that they had so many factory mistakes that didn’t fit mil-spec that they sent them out to competent shop to re machine them to be somewhat useable after they found out it wouldn’t fit mil spec

    • Some Rabbit

      I was able to replace the front pin with a mil-spec push-pin on my pre-ban Colt. Never checked the size of the trigger group pins though.

      • Anonymoose

        Originally the SP1 came with screws instead of front pushpins, but if you took those off and had a detent and detent spring handy you could use a regular pushpin.

        • DJ9r

          No, you couldn’t.

          Those original SP-1 models didn’t have the raised area (“fence”) around the mag button, which was also extended forward to allow more metal around the area that was (eventually) drilled for pivot-pin detent and spring hole. Any hi-res photo of the right side of Colt rifles/carbines of that era will show the flat-sided receiver. No thick metal, no hole, no way to use the later detent and spring for pin retention.

          Some aftermarket company made a pivot pin with a spring-loaded detent ball installed crosswise at the end of the pin, so it could replace the dual-screw pivot pin and only be retained by spring pressure. They were a popular upgrade for Colts of that era.

      • Ken

        Hmm, I wonder if they varied. A friend of mine tried to put an SP1 upper on his modern lower and didn’t know he needed an adapter. The fit was too sloppy for the bolt to feed rounds out of the mag. The adapter solved that.

    • Deplorable Shocked Amazed

      Which happens to be why I haven’t bought a Colt AT in forever

      • Ken

        They’ve been mil spec pins for a while now.

        • Deplorable Shocked Amazed

          Yes, But I hold a grudge. Colt has been anti consumer and almost antigun … and in some aspects, very antigun. I have not bought a new Colt since the mid 80s. Any Colts I buy are used and typically pistols.
          There are so many AR rifles and part makers today. I refuse to give Colt money.
          If some gun guys buy it, maybe. But until then … my dollars go to gun guys

  • rs

    I have a ’95 Colt with the block, the neutered BC, no bayonet lug, and no muzzle device. It was my first AR, and, while I realize it’s a bit of a relic, it’s still a fine gun, which I treasure to this day. If I had to bug out, this is still the gun I’d take.

  • Vitsaus

    Colt was the original “You suck and we hate you.” Gun company.

    • supergun

      I heard H&K was. But I agree with you.

      • 300 wm

        HK does it in an angry German accent. That is the only difference.

        • supergun

          They can be obnoxious.

  • Ratcraft

    I was thinking earlier today. Before my brain began to cook from it, I thought. If weed can be voted in as legal, hence defying federal law. Why can’t states vote in all kinds of laws flipping the big bird to the NFA? You would think maybe the NRA, or one of these other big buck makers from gun enthusiasts would support, fund and drive a referendum and put it to the people in a clearly red state. Then my ears started to smoke and I had to go back to sponge bob reruns.

    • PK

      Look up the “Firearms Freedom Act”, it tried to do what you described. Basically, the Feds ignored it as they didn’t ignore the state-level drug laws.

    • int19h

      You misunderstand the nature of “legal weed” laws in states that have passed them.

      Prior to legalization, weed was illegal in those states according to STATE law. Thus, they passed a new law to repeal the old law (and replace it with some regulation, usually). Those new laws don’t say anything at all about the federal laws on the same subject, so the latter remain in force. That’s why such legalization is constitutional – it does not attempt to override or otherwise defy federal law.

      The practical effect is that state law enforcement agencies no longer enforce state drug laws, or cooperate with DEA. So if the feds want to enforce their laws, they’re welcome to do so, but they have to do it solely with their own resources. Of which they don’t have all that many.

      With NFA, you can have the same thing, in a sense that if your state has laws regulating NFA items, you could repeal those. But that wouldn’t do anything about the federal laws – and ATF seems to be much more aggressive about trying to enforce them everywhere compared to DEA. So…

      Now, some states have specifically passed laws claiming that NFA does not apply to firearms which have been manufactured and sold within the state (i.e. where the common sense interpretation of what “inter-state commerce” means does not apply). These would likely be struck down as unconstitutional if feds ever take states to court over these, because they do explicitly contradict federal law. But I’m not aware of any state trying to enforce such a law so far (i.e. deny ATF the ability to crack down on NFA violations in their jurisdiction), which is probably why the feds haven’t bothered.

      • Grey Beard

        That was a pretty good analysis IMHO. Where I live every medical marijuana card comes with a warning that just because it is legal in the state doesn’t mean that you can expect to take it through and CBP checkpoints. Perhaps the states could go full on Sanctuary status on the NFA like they seem to be fond of doing with criminal illegal aliens and really risk the path of AG Sessions.

        • int19h

          Yup. Speaking of CBP, it reminds me – in Washington State, if you go to San Juan islands, it’s a ferry from Anacortes on the mainland. Now, there’s a ferry that goes directly back and forth, but there’s also one that goes from British Columbia through the islands – and the CBP checkpoint for it is in Anacortes. So if you board it on the islands, even though you’re travelling from one point in US to another, and not crossing any border, you still have to go through customs.

          Worse yet, a few years ago, CBP has decided that since the dreaded Canadian smugglers, terrorists and refugees could get off the international ferry on the island, and then board the domestic route, they are entitled to process passengers of *all* ferries as if they were international. So you could buy tickets to the direct route, and still get free rectal probe and other goodies courtesy of Uncle Sam.

          The best part is that if you go from mainland to the islands, and then back, you only get this treatment on the return trip. And given that San Juan is a popular vacation destination, and weed being legal in WA, US citizens buy and pack that stuff in Anacortes to spend some quality time there, get to the islands without any troubles, and then once they travel back, get the surprise customs check when they disembark. Well, not entirely a surprise – there are signs on the ferry telling you that might happen – but I wouldn’t exactly call it prominent.

          Fun times.

          • Grey Beard

            That is the weirdest thing that I have ever heard of. Granted most of my experience with CBP is along the southern border going through their checkpoints on vacations or hunting trips, I did have to Google Earth it just to visualize what you were describing. The only thing I could figure was that Anacortes was the common destination and they didn’t want to put offices on both that point of entry and San Juan as well and it was easier just to inspect everybody as if they were international travelers. Now you have given me a research project for the weekend. What color uniforms are they wearing just out of curiosity?

            I can kind of see their point as Canada’s immigration policies have grown so lax in the past couple of decades and I do recall reading an article right after the Y2K scare about the Millennium Bomber and his political asylum claim being a harbinger of things to come. It is kind of a tough question on how much is enough and how much is too much when to comes to these types of activities.

            Personally I have never been a big fan of most of the guns laws passed on the federal level and even less of a fan of some of the state laws. As it stands right now I would have to sell just about every gun I own with the exception of a few shotguns and a few pistols just for the pleasure of moving to California to retire, not to mention all the magazines that would have to go to somebody. It has always seemed silly to me that I cannot buy something as impractical as a Thompson with a 10 inch barrel without federal tax stamps when I am reasonably certain that the Tommy gun has never been a favorite of criminals after Prohibition died. You are certainly correct my friend, fun times we live in, fun times indeed.

          • int19h

            Yeah, most ferry traffic from Sydney (BC) would go straight to Anacortes on the mainland – there isn’t much of note on the islands other than for vacation purposes. So they would either need to have two checkpoints – one in Anacortes for direct ferries from Canada, and one in Friday Harbor for those coming there – or else kill one of the routes and require people to always take the other one, even if they don’t care for the stop in the middle. But two full-fledged checkpoints are expensive, and killing the route would annoy the locals, who are used to having it for decades now.

            I haven’t been in a CBP checkpoint on a ferry from Friday Harbor to Anacortes, personally – they don’t do it every time, just when they feel like it. Which, from what I heard from others, is still often enough. So far as I know, it’s the regular CBP border agents, same as you can see at e.g. the Peace Arch crossing.

            I immigrated to Canada before coming from there to US, and I wouldn’t call their immigration policies lax, relatively speaking. Especially when it comes to permanent residence – it’s actually harder to get it there than it is in US. It takes less time because they process people faster, but that’s partly because the queue is smaller, because of more stringent requirements wrt skills, language knowledge etc, and a point-based system to assess those. Basically if you don’t have enough points, you need not apply.

            Family migration is stricter, as well – it’s easier to bring your extended family to US than it is to Canada. In Canada, it’s easier to be an economic immigrant (skilled worker, investor etc), and such immigrants the majority of all legal immigrants. Whereas in US it’s actually ridiculous just how much harder it is to immigrate as a skilled worker, versus a relative of someone who’s already a citizen; as a result, you get two family immigrants for each economic immigrant. No wonder people are complaining about drain on the system.

          • Grey Beard

            Thanks for all the illuminating perspective on this topic. I have read so many claims recently about illegal aliens flocking to Canada and I found it kind of hard to believe. I also hadn’t realized that the queue was so small as the articles seemed to sensationalize most aspects of the process.

            I concur about the US system being absurdly difficult for permanent residents as well as some of the skilled non-immigrant visa requirements. We seem to have always given more preference to families than we ever have given to skilled workers or investors for that matter. I think the problem we have is that we always get mired in every immigration debate because you have so many groups that are at opposite ends of the spectrum on what they feel should be implemented and as a course of this huge gulf there never is a middle ground to be had. I guess you can use that analogy about much of the political landscape in these parts nowadays.

            Why did you chose to immigrate to Canada first and then the US? Was that due to how difficult it was to get here directly due to the preference system?

          • int19h

            Yeah, it’s just an easier track. As a skilled worker (software engineer), coming to US, I was facing H-1B quotas and the associated queue; and my spouse wouldn’t be able to work at all even if I got the visa. In Canada, so long as I scored enough points (young age + strong English proficiency + degree or equivalent industry experience pretty much takes care of this) and a job offer from a local company for above-market-average salary, that’s all they needed to issue me a visa, and it also covered my spouse.

            Once you have the visa, there’s a lot more peace of mind in Canada as well – in US, if you get fired or laid off, your H-1B terminates basically instantly, and you have to leave the country. In Canada, you get a grace period to find a new job and reapply.

            The biggest difference is what happens when you apply for permanent residence / green card. In Canada, that process is completely independent from your work visa, and therefore your employer – you just need to spend enough time in the country, and score high enough on their metrics. It also helps if you go through the “provincial nominee program” – this is basically a system where individual provinces write up lists of skills that are in short supply in their job markets, and give preferential treatment to people who have proficiency in them, on the condition that they settle in that province (until they get citizenship, anyway). This can be kinda weird – e.g. Quebec uses this system to attract French speakers. But most provinces just want high-paying taxable jobs. Same thing for investors, if you invest in some industry they want to encourage in that province, you get bonus points. Some also give preference to graduates of their provincial colleges, to attract people who want to get a degree and then stay. All in all, you can go from landing with your passport to PR in about 3 years, give or take – and it’s all up to you, not your employer.

            In US, if you’re H-1B, you have to be sponsored by your employer to even be able to apply for green card. The amount of time you spend waiting before they even start processing your application depends on the length of the queue, which in turn depends on which country you’re from. For Indians and Chinese, it’s really crazy, IIRC processing times are over a decade by now and growing. For me it was 4 years. Now, while you’re waiting, you have to continue working for the same employer. If you leave (or get laid off or fired), they can’t sponsor you anymore, and your application is thrown out, no matter how long you’ve been waiting. Even if you have another job offer lined up right away, you’ll have to start the green card process from scratch.

            Needless to say, this is ripe for employer abuse – they can basically hold that green card over your head for as long as you’re waiting, and you can’t really complain about anything, negotiate wages etc. Generally speaking, the companies that actually need highly skilled workers and pay above market rates – this is mostly large corps like Google or Amazon etc – don’t do that kind of thing. But they account for something like 10% of these visas, if I remember correctly. The remaining 90% are sweatshops that use the program to bring in cheap labor, rely on various accounting and legal tricks to effectively pay them below market (despite visa requirements being “prevailing market wage”), and use any leverage they can get to keep their employees in line, including the green card stuff. These companies aren’t in the headlines because they are set up as “consulting shops”, meaning that they contract that labor out to other companies. To name some names, the biggest abusers are Tata, Infosys and Wipro. These are all Indian (as in, headquartered in India) multinationals. and mostly bring in Indian employees. Their clients are basically all the big corporations in this country. I’m not aware of anything similar in Canada, I think mainly because they take the wage requirements much more seriously there and crack down on attempts to circumvent them.

            Why did I end up in US after all? There’s lots more jobs in my industry here, and pay is higher because they’re all competing hard for the limited number of workers; living expenses are lower, houses are cheaper (especially comparing Seattle to Vancouver!), taxes are generally lower. Well, and I like the gun laws, of course. Even then, I probably wouldn’t have bothered if I had to go through H-1B for this; but after working in Canada for a while, I had an option of transferring to the subsidiary of the same company in US on a different kind of visa (L-1) that was less limiting.

            I think that the reason why things are the way they are in US is that it has a very ad-hoc set of immigration laws and regulations that aren’t really designed to work together to implement a single clear policy. It’s just Congress passing this bill to address that “OMG somebody please do something NOW!!!1!” issue of the day, and they just sort of pile up, and of course different parties pass them under different prevailing public opinion, so you just end up with an incoherent byzantine mess.

            And then reforming it is even harder, because immigration is such a hot topic in US politics – a lot of people are pissed off about how things already are, for various and often opposite reasons, but if you try to change something, then some of those people will become pissed at you specifically. And then you have the growing partisan divide, where extreme left basically demands open borders, and extreme right demands shutdown of all immigration – so centrist politicians lurking in the middle trying to hammer out some working system (and there are some – it’s one of the few remaining areas where you actually see some meaningful bipartisan legislative work happening) get blasted from both sides. So nothing gets fixed, just minor tweaks here and there.

            As usual, the ones that benefit most are the lawyers, and next after them are the big companies that can hire those lawyers to find and exploit loopholes to their profit.

          • Grey Beard

            All I can say is thank you for such a detailed response as that was an education in itself. I just did a family genealogy due to a First Generation SAA Colt that I inherited and it was kind of amazing to see how my family immigrated here and all the little things that came into play with each branch since one side of the family tree immigrated here before the Revolution and one in the middle 1800s.

            I know very well what you described with the H1B visas since a family member was engaged to an Indian man who was working here under one. It was a nightmare talking with him on his trials with getting it in the first place and then having his company do a reorganization where he was going to lose it to getting his K1. He was fortunate enough to have been working for one of the 10% companies but he did have several friends that found themselves in the 90% category. I have always been kind of leery about the H1Bs since from its inception it appeared to be prone to wage manipulation to say the very least.

            I totally agree with you on the way we have done any immigration related legislation during my life time. The one thing I find most telling about every bill is how there is never a congressman or woman that sponsors the bill that is from any border state in the SW. There is never any legislation that ever gets passed without a WTF cause associated with it from everything I have witnessed and the partisan divide just keeps growing with every election cycle.

            We see it with every hot button issue that comes down the pipe without exception. I love the provision of our gun laws that prohibit anybody that uses any illegal controlled substance from possession of a firearm. With the current trend of so many states legalizing medical marijuana at a minimum, that outdated legislation has effectively stripped that right from untold millions of citizens who are well within state laws.

            Thanks for that pic as well. I used to know a guy that worked for the Border Patrol up north and some of the pictures he had from work up there were just amazing when contrasted to what the border in the SW looks like. One of the first was this wide swath that was nothing but grass and a monument as far as the eye could see and it was flanked by this thick forrest of huge pine trees.

          • int19h

            Regarding self-reporting, in many cases it’s just acknowledging the realities given how the border with Canada is set up. For example, here’s what it looks like at Point Roberts from the Canadian side.

            https://uploads.disquscdn.com/images/919a517da4c19cc4fd33ab8f035b958098b71852584f6cfde8dc050011233d76.jpg

    • Mystick

      I believe Wyoming has.

    • Old Vet

      I think there are a couple of victims of what you have suggested already. I believe one or two states have tried it and in both cases the persons ended up charged by the FEDS…..and are looking at jail time.

  • koolhed

    I haven’t forgotten about this phase of Colt’s history, especially when I’m in the market for another firearm.

  • HH

    never seen one of those specific blocks. interesting.
    I guess they quickly moved to just making them all “high shelf” back by the lug. That prevents lightning link use and most manufacturers are high shelf to this day despite no legal requirement to do so.

    • int19h

      Which manufactures aren’t high shelf?

      (Just asking for a friend, of course.)

      • DwnRange

        Thanks to DPMS selling to the Freedom Arms Group, can’t say for certain in 2017, but most all my lowers are DPMS as the older ones were always Mil-Spec – Larue, LMT, Noveske are too, IIRC.

      • Ken

        PSA should be low shelf.

        I don’t believe the high shelf prevents lightning link use. I believe it only prevents DIAS use.

        • James Leason

          PSA is good but still not to M16 specs on the internal FCG pocket. If you want lightning link it will work fine. If you want tru milspec dimensions in the pocket it is not to the milspec.

          • Ken

            Will it take a RDIAS though? Of course the side walls are too thick to be M16 spec, since the ATF considers that a full auto feature.

          • James Leason

            Actually ATF doesn’t consider it to be a full auto feature. BCI lower are milled to the mil spec. Only thing missing is the GI sear pin hole. Receiver walls are same spec as govt issue rifles have measured them with the caliper thingabobs. ATF considers the sear hole to be the sole defining characteristic of a machine gun in this case. No sear hole, no machine gun.

            Will RDIAS fit? No, the fcg pocket is too wide for that as it’s GI sear size, and not the commercial size.

            I think BCI literally made these lowers for SOT’s so they would be easy and cheap to convert via the safety sear method. They do not advertise that( and they would be dumb to do so) but that is their intended purpose I’m 99% sure of it. Lol i was going to ask them why it looks like a M16 on the inside but thought better of it. Some questions are better off left in your head.

            Very solid lowers though. Put one next to a Colt or BCM and they are of the exact same quality if not better.

          • Ken

            Hmm, hadn’t seen the BCI lowers before.

          • James Leason

            https://uploads.disquscdn.com/images/163e53bef39ac64f39d871323fe4222cec38c68fc0ce2ae98b10815baa6ef5d4.jpg

            It looks like the armscorp lower(think they went out of business?) which is exact same as M16 on the inside.

  • Paul Hurst

    Sear Block came out well-after 1986.

    Neutered B/C was pretty much the norm. Upper was not sear cut, and used different holes so you could not use a M16 upper.

    Colt, Because you suck and we hate you.

    • James Clark

      maybe i’m missing something but there is no difference between a semi auto upper and full auto upper other than the bolt carrier.

      • Phillip Cooper

        He’s referring to the bottom of the BCG being cut to avoid tripping the sear.

      • Paul Hurst

        Yes you are missing something. Things today were not always this way. Back in the day of sear blocks and earlier-

        Colt did not cut sear relief into upper receivers, and they use different sized takedown holes so an full upper would not work with a semi lower.

        As for the bolt + carrier, they cut the carrier so it would not trip the sear, and they ramped the underside of the carrier so the hammer would get hung up on the firing pin if you tried to slamfire, and they also used a larger firing pin to easier catch the hammer.

        So there were a lot of differences back in the day.

  • DwnRange

    And RRA lowers had a high-rear shelf too for the same reasons, how is this news?

    (pssst – ya forgot the “screwed” front oversized pin)

    • Some Rabbit

      As I noted above, I had no problem replacing the screwed pin with a mil-spec push-pin and spring detent. I have the 6551 model.

  • Mr. Katt

    Milling Machine
    New Bolt Carrier

    OR – get an Anderson Arms lower, switch the parts that’ll fit, put new parts in it that are normal, add an 8m/m to 6.35m/m adapter in the upper to mate them.

    Then cut the Colt lower in half, send it back to them and tell them to go (bleep)

  • Renov8

    Amazing how far gun rights have advanced…and still have a lot of room to expand.

    • Bradley

      How do you figure? The time period referenced was before the machine gun ban. Everything else is pretty much the same, and even worse on a lot of state and local levels.

      • Porty1119

        Constitutional and even shall-issue concealed carry were not really a thing back in the 80s outside of a select few areas, nor were stand-your-ground laws prevalent. Armed self-defense outside the home is doing quite well legally compared to thirty years ago.

  • Yankee

    Ok, dead horse beating!!!!

    Colt, like three or four management teams ago, in a different political climate, with different business considerations. So what? BOYCOT!?!? And we once went to war with Germany and Austria so burn your H$Ks and Glocks, and Sigs, and…

    • Nick

      They’ve been against us from the beginning. Look back to the hearings on the NFA. The AG had convinced them to “cooperate” with them on their plan to eliminate machine guns.

      • Curious_G

        But yankee’s comment stands. It was a different company structure/management team at that time. Frankly, you could come up with a reason to boycott just about every gun company out there if you wanted to.

    • Deplorable Shocked Amazed

      Colt has been this way since the mid 80s. I have not seen a behavior change. The money grubbing management changes, only to be replaced by the same.

  • Veteran for Trump

    All you need is an 80% lower. Mill and drill it to M16 specs. Install the fun stuff. It ain’t that hard.
    Voila! Unregistered MG.
    NOT that I would recommend it.

    • 🦑 🐙

      And it wouldn’t be too darned hard for a machinist to make DIAS’s. Luckily, criminals don’t care about full auto, or they’d be everywhere.

    • Lee Attiny

      All you have to do is drill a hole for the sear pin. Otherwise the specs are identical. No need to mill out a whole lower. Making your own lightning link would be extremely easy as well.

      • Veteran for Trump

        No, there are differences in the M16 and AR15 lower to the rear of the trigger. M16 on the right.
        https://uploads.disquscdn.com/images/b8fc1b62e9f5f70f523e589ff3f4e1aff476fb4046013610fc3af3e07b6139c5.jpg

        • Lee Attiny

          If you used an AR lower with the high-shelf pocket I think you could squeeze it in. Maybe I’m wrong though.

          • James Leason

            There is a certain lower receiver manufacturer that produces a 99% M4 milspec lower receiver. The FCG pocket is milled to the same internal dimensions as a select fire m16/m4. All that’s left to do is drill the sear hole. After some intense research on lowers I found them on the web via Midwest gunworks. Went to my local FFL and compared to a SOT sample and it was the same except for sear hole.

            It’s as close as you’re ever going to get just don’t drill that hole and you’re safe.

            Google BCI lowers and eventually you’ll see what I mean…

          • Lee Attiny

            if I were to do this, which I’m most certainly not, I’d go the lighting link route over modifying the receiver simply because you can remove the lightning link and the gun becomes instantly legal again.

          • James Leason

            True. But where are you going to find one of those that’s guaranteed to work? I mean yeah there are drawings all over the net but you have to have tool steel and a machine shop to do it the right way. Easier to drill hole and hide somewhere not in your name.

  • 🦑 🐙

    Why are the Colt hammers notched on the top like that? My 6920 hammers are the same way.

    • Ken

      As mentioned, it prevents the bolt from closing it the hammer happens to follow the bolt as it closes. That can happen for any number of reasons, like a defective trigger group, illegal modification, or simply outrunning the trigger. If you pull the trigger too quickly, you’ll release the hammer before the bolt has closed and get hammer follow. It’s actually not difficult to do with some of the fancy triggers.

  • Daniel Lewis

    I have always viewed Colt as the Apple of the gun world, our products say Colt so they are super valuable and you should pay 1,500 for our 1911 that is almost identical to the one over there for 799.00

    • pun&gun

      At least Apple innovates. Colt hasn’t done anything for decades but reproduce legacy firearms (not even originally of their design) for government contracts.

      • gusto

        Apple dennovates

  • Joey Dryer

    My Colt AR from 2013 has a similar web block there. Very annoying when I wanted to install the Fostech binary trigger unit. Had to get a new lower. If I had known about it, I would never have bought it.

  • Flounder

    Was? Still is man. Except they have to add “we are broke”

  • Some Rabbit

    I see some discussion about removing these blocks below. Just a note for those who have a pre-ban Colt AR, they have some appeal to collectors so think twice about defacing the gun. Better to just buy a more modern AR if you want a gun you can tinker with.

  • tiger

    So following federal law and being mindful of the liability issues means they are a bad company? That is warped thinking.

    • Porty1119

      Federal law is uniformly a product of warped thinking.

    • They didn’t do it because of federal law.
      Federal law doesn’t require EITHER change (FCG block or mutilated bolt carrier) to an AR15.
      That’s why pretty much NO OTHER COMPANY does it.

  • steveu

    I chopped mine out with a dremel tool to get my Geissele (guys lee)trigger in.

    • James Leason

      Would have been better off selling it and buying something else. Colt’s are not worth the cash anymore. There are better lowers out there. BCM is a good start.

  • Don

    YES but the removal of the bayonet lugs just went to prove how good the AWB really was. Over the 10 years of the AWB, there was NOT one single reported drive by bayoneting. We need to bring this back immediately if not sooner, got to bring an end to bayoneting carnage on our streets…

    • Rollin L

      Don, I am with ya. I remember the days before the ’94 ban. Like in most suburban neighborhoods, the volume of rifle-mounted bayonetings on my street was outrageous. Seems there was one or two most every Friday or Saturday night, on every block. Thank goodness Clinton ended that tragic epidemic, and I can only suppose that the reason we did not see an immediate resumption of these horrors after 2004 is that people just learned that this was no longer acceptable behavior. Almost as bad were the flash hider burns from people holding that birdcage too close to their faces when they fired celebratory shots in the air. Never enough burn ward beds to take care of the huge numbers of victims. But some people are just too young to remember those times, when the number of emergency room visits for pinched-finger blood blisters, from carelessly collapsing a CAR stock home, was enough to drive hospitals out of business. Thank goodness these horrors are a thing of the past. That ten year drought where we had no new production of these evil gun features was all it took to change society forever. We should all be grateful.

      • Doug Dickey

        Don and Rollin have clearly grasped the concept of how our government is working day and night to keep our streets safe. Perhaps the two of you could help me convince my disturbingly conservative Congressman to sponsor a bill that would ban the production of “black guns”, requiring that all firearms must be of bright, happy colors that would have a calming effect on anyone contemplating using a gun in anger or for evil purposes. And in defensive use, the pretty colors would assure you that in our inoffensive feel-good world ten rounds is plenty.

        • Don

          I love it! Maybe a flash hider in the shape of a SMILY FACE and with all the stuff they are hanging on a rifle these days maybe a small flower pot…ohhh happy, happy, joy, joy our streets will be safe again…

          • Dietrich

            How about a little white metallic dove that attaches to either picatinny or weaver rails. It could have a battery powered chirp of kumbaya.

  • Joseph Rivers

    There is no point in buying from Colt. There is an abundance of excellent companies to buy from. Colt isn’t one of them. End of story.

  • AR-PRO

    I’ve been complaining about these since Colt started their Anti – freedom movement.. They loved kissing that government sugar daddy a**.. Sad thing is that I have a bunch of these lowers, lol. There were ways around the sear block, it was more of an auto sear deterrent than a DIAS or lighting link killer.

  • Dietrich

    Haven’t bought a Colt since the 1970s. They are nothing but a holding company, neck deep in lawyers and contract out most of their parts. They tack on an extra $300 for that rampant Colt stamped into the metal. With all the good AR15 and 1911 makers, who needs them?

    • Dixie Shooter

      The first and only new Colt I’ve ever bought was a Government Model 1911 around 1980. If you let it rip it would jam on last round every time. If you took your time it would feed them all. I sent it back twice and it was never fixed. Colt is just a name with a very high price tag on it. My AR is a Windham Weaponry M4 that’s problem free and I wouldn’t trade it for a Colt or any other brand on the market. Straight out of the box you can’t beat it. My 1911 is a Remington R1 that’s problem free and I wouldn’t trade it for any other brand on the market either. If you have a firearm that you can trust to do it’s job all the time then the brand is just a name.

      • Dietrich

        Bought a Windham M4 for my daughter for Christmas and she loves it . My parkerized Springfield 1911A1 is one of the most accurate pistols I’ve ever owned and a keeper. I wouldn’t dream of trading it for a brand new Colt. Colt needs new ownership and a move to a pro gun red state.

        • Dixie Shooter

          You are absolutely correct on that. Remington Outdoor Company moved to Huntsville, AL about 35 miles from where I live in New Market, AL. It’s a lot more than just Remington firearms made there though. It includes Bushmaster Firearms, DPMS/Panther Arms, Marlin, H&R, The Parker Gun, Tapco, Advanced Armament Corp., Dakota Arms, Nesika, Stormlake, Timbersmith and Barnes Bullets. Some of these are gun accessories makers. All of the MSR type rifles and all of the pistols are made here if I’m not mistaken. I heard on the news one night right after Remington moved down here that Colt, Stag Arms, and another gun maker were looking at moving down here because we are a pro gun state. I haven’t heard anything else on it since though. They would have plenty of workers to choose from since where I used to work and several other companies decided to move their production to China and Mexico.

          • Dietrich

            Glad to hear that. I’ve always liked the old south and folks from Dixie. May they all prosper. May take a leisurely trip through there one of these days. I’m from Arizona and we have constitutional carry and a lot of firearms industry here as well. Keep flying that Confederate flag and don’t give them an inch!

          • Dixie Shooter

            To me the Confederate flag is a beautiful piece of work. A good friend of mine has one that was actually carried in battle and was handed down to him from previous generations. It’s not about hate, it’s our heritage. I keep 2 flags up and wear my CS belt buckle all the time and I don’t hate anyone. But you’re correct about not giving them an inch because if you do they will want the whole place.

          • Dietrich

            I agree completely. I had ancestors who were in Lee’s Army of Northern Virginia. That’s pretty cool having an original Confederate flag. The media and academia have managed to vilify the flag, our heritage, beliefs and values. I’m on good terms with people of all colors but will not surrender my freedom. Our enemy is the NYC media complex that seeks to divide us. Dr. Kevin McDonald’s book, The Culture of Critique goes to the heart of those who are destroying America.

          • Dixie Shooter

            The news media will sensationalize anything to get a rise, or stir up problems for a story. All of the Confederate markers, statues, and anything else that represents the Confederacy were OK until people like Al Sharpton and others got the news media to go along with and encourage all of the uprisings across the nation to remove them. It seems like the reporters would go hunt for items and report on them to get trouble started again and again just so they would have a story. I’m no racist but I also don’t owe any race anything. You respect me and I’ll respect you, simple as that. Like you, I’m on good terms with all people and treat others like I want to be treated.

          • Dietrich

            Yeah Sharpton is the lowest form of guttersnipe, stirring up hatred wherever he goes. Amazing the IRS hasn’t gone after him for the millions in back taxes he owes. Hopefully Attorney General Sessions will give him the justice he so richly deserves. There is an old Confederate veteran of the battle of Picacho Peak buried about 1/4 mile south of me. He homesteaded here long ago.Amazing we had Rebs here in the remote Arizona desert.

          • Dixie Shooter

            It sure is. About 5 miles from my house is where my daddy was raised along with his 7 brothers and 3 sisters. His 1st cousin lived about 1/2 mile on past him. This was way back in the holler (that’s the way we say hollow for the grammar freaks) at the foot of the mountains. When me and my brother were little kids my daddy would carry us back up to his cousin’s house and we would shoot rifles all day. He taught us to shoot as soon as we were big enough to hold up a .22 rifle. Needless to say we were taught right by a WW2 veteran. Anyway, in front of the house was a sawmill his cousin had. Up from it was called Sawmill Holler. Back up in there was a shallow cave about 20 or so feet deep with a crystal clear spring with a pool about 15 feet in diameter out in front of it. That place was called Devil’s Den. We would find Civil War Minni ball bullets all around that place. Daddy’s cousin found a complete rifle and part of a CS metal sword scabbard and whole boxes of bullets up there. I can’t remember what type of rifle it was for sure but if I’m not mistaken it was a Sharps rifle. His daughter still has them. How I would have loved to have had a metal detector back then. They must have had to leave in a hurry to leave all that behind.

          • Dietrich

            It’s great that you’re connected to your Confederate heritage and family traditions. Hope that cave and pool are still accessible to you and your family. My grandfather was a WW1 vet and taught me to shoot a rifle. His brother was killed at Ypres by German artillery and is buried in Belgium. We have to pass our ancestral history and traditions on to our kids and grand kids in defiance of the home grown Marxists. I’m a Life/Endowment member of the NRA and have taught my daughter to shoot. I live not far from Geronimo’s homeland, the Chiricahua Mountains. The Apaches were perhaps the greatest guerilla fighters of all time. Artifacts can still be found with a metal detector all along the southwest border.

          • Dixie Shooter

            My Great Grandmother on my Daddy’s side was a full blooded Cherokee Indian. I haven’t been to the Devil’s Den in many years, but a friend of mine that lives close to it told me a flood came down the mountain and washed it all away, except for the cave of course. He said I wouldn’t know it now. I still plan to go back there and see for myself. I’m an NRA member also, I’m paid up for a couple of years. I can’t afford to do the lifetime membership, too much money all at once. Even though we’re from one extreme to the other East to West, we have a lot in common and share a lot of the same views. It’s funny how when you get to talking or communicating with someone far away it isn’t long until you see it’s a small world after all. It’s been very pleasant chatting with you my friend and would love to talk more but I’ve started checking my eyelids for cracks so that tells me it’s time to either lay down or sleep in this chair. I think I prefer to lay down but we can pick this up later if you want to. There’s a lot of history out there and I love talking about it. Take care and God bless you my friend.

          • Dietrich

            You’re more than doing your part my friend, unlike so many gun owners who won’t join, knowing that the rest of us keep up the political fight. I’m enjoying our communication as well. Went through basic training and AIT with guys from Georgia, Alabama and the Carolinas. Always appreciated their easy going ways and sense of humor along with their marksmanship. I’m a collector of Mauser rifles and a student of the Eastern Front of WW2. Am interested in historic firearms throughout American history. That’s pretty cool having some Cherokee bloodlines. Grew up in Montana around the Blackfoot, Northern Cheyenne, Crow and Cree. Sleep well my friend and God bless you.

  • bobk90

    This is why I tell preppers & survivalist to not waste their Money on an AR or AK. I tell them they’d be better off with a good Solid Bolt Gun and then Snipe at any invading force to include the Feds and then pick up a Full Auto for the Cost of a Bullet… Not to mention have a great Hunting Rifle if nothing happens!
    Just sayin.

    • Nicholas Feeley

      Then again, if you already have an AR or AK, you already have lots of ammo on hand for when you pick up a Full Auto from the invading force, as opposed to just what the enemy was carrying at the time…

  • Fortunately, Bridgeport makes a great bird to flip these guys – that doesn’t address the takedown pins, but you *can* manipulate it otherwise.

    Course, don’t go full giggle unless you have the right taxes paid, as I do. 😀

  • TheGrammarMan

    Yes, it’s complete poop storm. I lived the horror of those bad days of Colt cave-in. Thankfully they can now go choke on a bag of bolt carriers.

  • XRGRSF

    If I recall correctly the sear block, and pins came into being when Colt made a large run of select fire receivers for a military contract that was canceled. In order to save their investment they had to modify the receivers enough to say that they were newly manufactured semi-auto units.

  • Pumpkin King XXIII

    Still it, bought a colt in muddy girl camp for my daughter and although it has a mil spec m16 BCG they didn’t machine out the pocket on the receiver so it still won’t take a DIAS or Lightning link.

  • David

    Looks like it was originally a 3 hole receiver, and they pinned that garbage in there and welded the pins. Would that explain the blemish in the finish as well?

  • Ben Dobreuenaski

    Colt has been riding on their reputation since WW 1. Now since a Zombie show has the hero using a Python you cant touch one for under 3k. This is a custom shop assembled gun that has problems with timing. It’s viewed as junk by most gun users.