New: Bullpup Unlimited’s Remington 870 conversion kit

Many of us own Remington 870 shotguns, and if you don’t own an 870 then chances are you own a Mossberg 500. But today, we focus on a new product out on the market, a Remington 870 bullpup conversion kit from a company called Bullpup Unlimited.


From the Bullpup Unlimited website.

The founder is a 26 year law enforcement veteran who has since retired. He has always been a fan of bullpup shotguns and has a sizable personal collection. But he wanted to take a Remington 870 and somehow turn it into a bullpup. Seeing as no one on the market did this, he tapped into his American entrepreneurial spirit and decided to figure it out on his own.

The result is what you see here:

An 18″ barrel is the minimum required length, and 12 gauge only. No 3.5″ models or ribbed barrels will work with the Bullpup Unlimited kit.

Here’s what the conversion process looks like:

The cost is $359.00 plus shipping and sales tax. No FFL is required and you have to BYORemington870. They are currently backordered one week, and as they continue to get more exposure, we might see that wait time increase over time.

Chris Cheng

Chris Cheng is History Channel’s Top Shot Season 4 champion and author of “Shoot to Win,” a book for beginning shooters. A self-taught amateur turned pro through his Top Shot win, Cheng very much still considers himself an amateur who parachuted into this new career.

He is a professional marksman for Bass Pro Shops who shares his thoughts and experiences from the perspective of a newbie to the shooting community. He resides in San Francisco, CA and works in Silicon Valley.


  • Liberator

    can you change out the pistol grip with any AR-15 pistol grip?

    • TDog

      Yes. I own a kit and switched the stock pistol grip with a Hogue pistol grip. Just like switching out the pistol grip on an AR.

      • noob

        Tdog, is the upper shroud needed to run the shotgun? or can you just use the bead sight on the 870 barrel?

        I ask because it looks like a pain to have to undo four more screws every time you want to field strip and clean.

  • JT

    This is very interesting, as long as it does not create problems with clearing malfunctions.

    • DiverEngrSL17K

      It’s interesting that you brought that up. I watched the cold-weather field test video compiled by “nutnfancy” on You Tube for the UTAS 15 bullpup shotgun and it was very clear there were real issues with ejecting spent shell casings. Clearing jammed cartridges, spent or otherwise, also appeared to be a problem. To be fair, the manufacturers have reportedly resolved these problems in current production guns, and there were other users who indicated few, if any, problems with the early guns as well. Such widely-varying reports and experiences might have been the result of inconsistent QA / QC, resulting in some guns that worked properly and others that didn’t. Hopefully, these issues have been addressed once and for all.

      • JT

        Well, I could see for the UTAS, but really for this one my only concern was that the stock would impede fully clearing malfunctions with the 870. It appears that the ejection post has plenty of room. I’m wondering how easily the 870 reciever can be accessed or removed if you had a stuck shell or something

        • DiverEngrSL17K

          Hi, JT :

          Chris did say that he would be posting a test report on it in a week or so after he’s done with Knob Creek. Perhaps we’ll find out then, or we could put in a request for him to check on this aspect while he’s doing the test.

          • There’s a decent chance I will get to shoot it later this week, it’s a matter of my schedule and the owner’s syncing up to see if we can meet back in Kentucky.

          • DiverEngrSL17K

            Thanks, Chris — Your time and consideration are much appreciated. Looking forward to your added input!

          • noob

            If you get a chance to shoot it, could you please see if it will run without the top shroud on, using the original bead sight?

            it seems that the field strip and clean involves the removal of many little screws, and the top shroud just adds four more screws.

          • DiverEngrSL17K

            Whoops, I forgot I’d already replied. Sorry for the mix-up!

      • BryanS

        After handling the UTAS personally, I dont think you could compare the 2 systems. The only way you could make the 870 worse than that system would be to encase it in concrete or something.

  • DiverEngrSL17K

    Hi, Chris :

    When you tried out the bullpup kit, how was the trigger feedback? Do you think the designer has managed to eliminate or at least reduce the typical “dead” trigger feel of a bullpup through an improved linkage?

    Judging from the videos, especially the second ( installation ) video, this seems to be a high-quality kit, with well-made components and good fit and finish.

    • Esh325

      The quality of the trigger on a shotgun wouldn’t be terribly important I believe.

      • DiverEngrSL17K

        True — but it still helps ergonomically as one part of the total sum that is the weapon.

      • BryanS

        Why? You still aim the things. That aim will be thrown off when you mash on a crummy trigger.

        (yes i know, traditionally you point a shotgun when doing clays / birds)

    • I only dry fired it a handful of times, and from what I could tell, it felt fairly crisp.

      Now that’s no substitute for actually shooting it of course, so I hope to get some trigger time in soon!

  • bbmg

    Poor man’s KSG? Good to see this project come to fruition.

    For those who prefer semi automatics with removable magazines, there are other reasonably priced bullpup shotguns out there:

    • AnarchyPrime

      Poor man should save up another $300 and get the real thing.

      • Fromthesidelines3

        I’d rather have an 870 based bullpup than an unreliable “real thing” as you call it.

        • AnarchyPrime

          That’s like saying you’d rather have an HK than an unreliable Glock. It’s just not a meaningful difference.

          • Drapetomanius Grimr

            False analogy. The Glock, HK, and 870 all have long track records, none of which are as troubled as that of the KSG.

            Further, the 870 runs about $500-ish, plus $300 for this conversion for a total of $800.

            Let’s look at Armslist sales of KSGs, shall we?

            $ 1,800
            $ 1,800
            $ 1,850
            $ 1,750
            $ 1,725
            $ 1,900

            Not a valid comparison. At all.

          • AnarchyPrime

            They’re going NIB for $1000-1200 on auction sites. The KSG doesn’t have any issues the 870 does not also have. Of course it doesn’t have a long track record. It’s new. The 870 didn’t have a track record when it was new. And everyone hated on the Glock when it was new (p-p-p-plastic guns!). The only issue the KSG has is occasional extraction issues, which are almost always user error. Doesn’t have any more extraction problems than the 870 does.

            Gun owners by and large have an almost pathological fear of change; it’s no wonder innovations in firearm technology come so infrequently.

          • Anon

            Remington has had a good track record as well as Glock. Not the same can be said about Kel-tec. Are *any* of their products standard issue for any police/military organization since they opened their doors? The proof is in the pudding.

          • AnarchyPrime

            If you think the police, military, or any part of the government buys “only the best,” you’ve no idea what you’re talking about. Most every purchase is based as much on politics as performance.

          • cZed75

            I think a good bar for quality with less political influence would be the highly specialist units that generally get more freedom over your average grunt with their toys. Alas, no usage (known anyways) of Kel-tec products in compared to the publicized lot of MP7’s, 416’s, Benelli M4’s, etc. Yet…

          • AnarchyPrime

            Perhaps. But even that provides limited insight, as there are also going to be all kinds of top-notch guns that few here would criticize, but that those units won’t consider.

          • Tim Jackson

            You can’t even compare KSG vs. 870 Bullpup. The KSG is designed with the pistol grip and trigger assembly already configured. The 870 Bullpup adds more internal parts to accomplish the same thing. Internal parts that according to Matt at Bang Switch add more potential for failure points, especially when some of those important metal pieces on your 870 you have to replace with the included plastic adapters. The Bullpup is most certainly a device which downgrades an already reliable platform. This is Matt’s youtube review after advising the company that he was undertaking an in-depth review. Pretty convincing! The video doesn’t explain much without reading his blog on

        • Josh man

          The Remington 870 is one of the best shotguns that you can for the money and that’s not just me saying that ask anyone who deals with guns and they will tell you. The 870 was rank second best a few years ago and it went up against shotguns that cost in the thousands and the 870 cost in the mid hundreds

    • KM

      Except this shotgun works

  • Hank Strange

    great Idea and JJ Hunter the owner of Bullpup Unlimited is a really nice guy, here is video I shot from the Bullpup Shoot also in Kentucky a few weeks ago:

    • Nicks87

      Thanks for the video Hank. Did you noticed if the AR-15 style pistol grip could be changed out for an aftermarket one (magpul, ergo, etc.)?

      • Tim Jackson

        Matt at Bang Switch tried to change out the A2 that comes with it with his CAA pistol grip, and there was a 1/4 inch gap between the top and the Bullpup kit. So, no, it won’t accept “a lot” like Bullpup Unlimited advertises. You’ll just have to research whether the specific grip you’re interested in placing on it has already been tested.

  • 朝花夕拾

    The whole idea for the bullpup shotgun originally came from South Africa during the apartheid era, when the Afrikaners came up with the Neostead to arm white farmers and help them defend themselves from black guerrillas.

    I guess the bullpup 870 could come in handy for ranchers living in border areas such as Arizona or Texas.

    • Anton Gray Basson

      Unlike Rhodesia, the South African government at the time did not wish to put a gun in every white man’s hands, instead security in rural areas tended to be handled by regional Commandos and Police. Also the Neostead shotgun came some what late for the Apartheid era. Prototype showing up in 1991, second one showing up in 1993 with the dual mag system and finally only going into production in late 2000. I dont really see the point of a bullpup shotgun, harder reloads for a system that is already a slow loader.

      • dp

        Historical fact against myth – way to do it. This is what I like to see in every discussion on TFA – to clear the nonsense. Personally, I met couple of whites who fled South Africa; it was not he paradise they wanted.

  • Clint Notestine

    looks like fun and far less hassle than trying to get s SBS

  • Joe Mama

    I got one a few weeks back, $299. I really like it.

  • Raoul O’Shaugnessy

    Right..because Mossberg’s bullpup shotgun was a game changer.

    • Michael

      Wish Mossberg would bring it back

      • RickH

        Only if they improved the “clamshell” stock/enclosure. I had one, just an awful product.

        • Michael

          I never shot one, remember picking one up and thinking it was clunky. They should be able to make a decent bullpup shotgun now, of course it will have lots of rails now. compare the Tavor with older bullpups, SA80, AUG and that ugly French thing.

      • st4

        One of the types I like to collect are those that got popular through cinema, such as my 29-2, “the most powerful handgun in the world,” or my Franchi SPAS12, “da twelve gauge auto loadah.”

    • dan citizen

      It was if you needed a prop gun for a low budget sci fi film

    • Leigh Rich

      I have one. Way too Heavy and clunkie to operate. As stated it was a first. Basically a 500 in a plastic clam shell.

  • john

    Would this work on the Chinese clones of the 870?

  • tomaso

    like the overall concept…but man is it ugly!!!!!!!!!!!!! and not in a good way = )

  • Jilu Khan Spandiary

    Nice, kit and all. But that guy needs to cut his nails. Eww.

  • dan citizen

    I like bullpups. I find it easier to enter and exit vehicles, etc and just plain handier. I also like the way they handle better. This is a personal preferance and one I know many do not share.

    That being said… I feel a little reluctant about pump action bullpups. I tried the old mossberg one and it was kinda ok. This one looks a lot sturdier.

  • nanoreaper

    do they make this is left handed?

    • Keep it Real

      No, they do not.

  • Asdf

    Can’t someone make a conversion kit where it is to clean the firearm? At least remove the barrel?

  • mechamaster

    The recoil.. more violent I think…

  • OmegaDR

    Would not beat my life on this contraption.

  • Todd

    Very cool. I’ve never used my Remington 870 as a tactical gun (more of a skeet and bird shooter), but I have been looking at to convert mine into a tactical gun. This would be handy to have in an emergency situation when my neighbors are hungry and gather together to come knocking on my door. I blog about kits like this at, maybe I’ll order one and write a review.

  • Apostle

    Poor man’s KSG?, perhaps, but one thing is certain this poor man’s KSG ..WORKS !!!!

  • Boots 44

    Good site. Keep up the good work.