Bigshooterist Talks About His Frankengun (971D)

Jeff of Bigshooterist YouTube channel has released a video where he talks about the machine gun that he has created. This is a very strange looking firearm, to say the least. This gun is made of all kind of different gun parts fitted together to become an ultimate Frankengun.

Bigshooterist even has a model designation for this gun – 971D. “9” means that it is chambered in 9mm (9x19mm), “71” is the amount of cartridges in the drum magazine (Suomi drum) and “D” designates the spade grip. The barrel jacket is taken from a Browning M1919 A4 machine gun. The upper receiver and the bolt are borrowed from MAC-11 and the lower receiver is an FN FAL one. The 971D also has an enormously high rate of fire of 1600rpm!

For more details watch the video below:

Why did they make this gun? What this gun can be used for? Why spend so much time to build this kind of a gun? Well, maybe it is totally impractical and useless, but there are two words that come to my mind – “cool” and “fun”. I would love to see more people experimenting with firearms and coming with such unusual and weird Frankengun designs! After all, who wouldn’t like to get behind this beast and dump the 71 round drum in full auto?



Hrachya H

Being a lifelong firearms enthusiast, Hrachya always enjoys studying design, technology and history of guns and ammunition. His knowledge of Russian allows him to translate and make Russian/Soviet/Combloc small arms related information available for the English speaking audience.
Should you need to contact him, feel free to shoot him a message at Hrachya@staff.thefirearmblog.com


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  • PK

    Plenty of people would love to experiment with simple, cool, strange firearms like this… but they’re nearly universally illegal to create as a private citizen, these days. Perhaps one day, that won’t be the case.

    • Harry Canyon

      What the Feds don’t know won’t hurt you…

      • TheNotoriousIUD

        The internet is probably a safe place to talk about it.

      • Phillip Cooper

        What the Feds don’t know will get you sent to “Federal-Pound-Me-In-The-Ass Prison”.

  • TheNotoriousIUD

    Thats damn impressive. I could see it possibly being used by protection services.

    Thats quite a gamble mutilating a registered MG to build something that might not even work. Nice job.

    • PK

      “I could see it possibly being used by protection services.”

      Too big for what it is, pintle adapters would be more likely. Still, it’s cool.

      As far as mutilating, that’s really just taking the magwell off. It can be welded back on fairly easily. The rest is just pinned on, MACs have uppers and lowers with the lower being the registered part just like an AR. That’s if this is a pre-86 and not just a F2 build.

      • TheNotoriousIUD

        Yeah I meant like maybe having a couple in the trunk to be mounted to windows or something.

        • PK

          Simple pintle mount on an MP5 forearm rail would do the trick, be useful as a regular SMG, and already exists in inventory in a lot of cases.

          Interesting thought, a similar ambush-breaker to the G18 and conversions, but 71 rounds and open bolt.

          • TheNotoriousIUD

            Might be useful during rush hour…

      • Stan Darsh

        That also gives you a neat excuse to weld a CCF grip/magwell to it when you want to turn it back into its M11/9 format.

      • noob

        If the FAL trigger group is the registered firearm part, the magwell is part of the upper and separates from the trigger group by means of a push pin.

        I’m hoping that is what happened here.

        Makes you think – if the USA had adopted the Long Arm of The Free World like the uk did instead of fielding the M14, an army-wide caliber swap to 5.56 could be accomplished by swapping out the upper and magazines for a SCHV upper developed for the FAL.

        If there were reliability issues with the powder fouling the gas piston, you could pop the takedown pin and swap back to your 7.62 nato upper and illicitly use ammo intended for the M60.

        And all your folding stock angst could be handled by the FAL-Para which relocates the main spring and buffer into the upper receiver over the bolt group.

        This could have been us bae, but you beholden to the military industrial complex’s vested interests in your congressional district. https://uploads.disquscdn.com/images/1d71f8c49a8b245eccbf1a2cc9b15413ca80ec8fc476d50c57e418efd5cebd5c.jpg

        • PK

          If the USA hadn’t pushed so hard on the M14 and the .308, we wouldn’t even have the FAL. NATO would very likely have settled on the EM2 in .280 British.

          A man can dream!

        • TheNotoriousIUD

          You know your Shiite.

        • Anon. E Maus

          An FAL in 5.56mm would be a pretty terrible gun, the FNC was developed for a reason.

          Also, folding stocks are vastly overrated for rifles, the M16 was a perfect choice in the end.

    • Cymond

      I didn’t hear the part where he says it’s a transferable MG. He does describe a FAL lower, M-11 upper, and a piece that joins them taken from another FAL/MAC hybrid.

    • Klaus Von Schmitto

      You can cut that bastard 100 times as long as the serial number is intact.

  • iksnilol

    Why…y no belt fed!?

    • TheNotoriousIUD

      At 1600 rpm he probably doesnt want to have to take out a loan to pay for ammo.

      • iksnilol

        You raise a valid concern.

    • PK

      The belt adds huge drag and slows the works down, the bolt requires a lot of work, you need to add a feed tray/pawls and top cover…

      Basically the short answer is “too hard/expensive” and the long answer is that if you sink the money and time into that, the ATF would very likely take one look and say the modification unit you made is, by itself, a new MG and welcome to jail.

      • It would be feasible– if perhaps not entirely practical– with a firearm where the serialed receiver is a different assembly than the feed mechanism/magwell, since you could do all the monkeying you wanted with the non-serialed parts.

        • PK

          Hey, I’m with you on this. Tell that to the tech branch though, they have pretty much kicked back every single MAC upper that ended up belt feeding, and a bunch of AR/M16 uppers.

          It usually goes like this… If you make a MAC upper that contains a bolt, feeds the ammo from a belt, and attaches to only a registered MAC lower, you get it confiscated as an unregistered post-86 MG. The problem you run into is making a self-contained upper that feeds ammo, but doesn’t have the ability to fire all by itself even with the guys there trying to get it to do just that.

          The ordeal of having a determination made on things like this is really something else.

          • Amplified Heat

            That’s mostly because they view these attampts as changing the ‘character’ of the gun in their opinion, as though there’s language to that effect anywhere in the law (I’m not aware of anything in the NFA describing limits to modification of already-registered items that doesn’t change their classification status). Just like the ix-nay on the M240 clone that takes registered HK trigger packs, it’s just the Bureau jamming it in deeper such as they can.

          • PK

            No kidding. I’m still bitter about a lot of that, too.

        • Amplified Heat

          Check out the Kel Tec RDB; the stamped steel cheekrest is the “firearm” believe it or not. I suppose it has the carrier guide rails bolted to it, but that’s the only “critical” component

          • noob

            I love their style. In the gen1 sub2000 the “firearm” was a weird little steel block you could pop out of the plastic receiver halves iirc.

            By gen2 the sub2000 buffer tube was extended to go up past the ejection port with a cutout for the cases to eject from and it then became the “receiver” and also the serialized firearm part. It is a steel tube. You could duplicate it with an angle grinder and 10 minutes of cutting.

            https://uploads.disquscdn.com/images/526ee77088dd3fca9c0febd8ac6f1e056755eb94149dc4c8c62e921e58282f9e.png

      • Paul Rain

        I suppose maybe it could be done if you could make some sort of electric/hydraulic feeding mechanism that would strip rounds and feed them into the regular magwell, akin to a minigun sort of setup?

        But then we’re reaching levels of perverted MACs that shouldn’t even be possible.

        • PK

          Honestly if that’s all you’re after, might as well make a gravity hopper with spring assist.

  • Veteran for Trump

    So is he a FFL07 with a SOT2?
    Must be nice to be rich.

    • PK

      Rich? Setting up to do that isn’t too expensive so long as you either don’t need machinery, or you already have it. The licensing itself isn’t pricey, Federally.

      • Veteran for Trump

        FFL07 – $150 for 3 years.
        SOT 2 – $500 every year.
        Register with State Department under ITAR – $2250 and $1000 every year.
        Did I miss anything?
        Not pricey?

        • Grey Beard

          Having the coolest frankengun on the block……priceless. For everything else there is MasterCard. Now how do we get a percentage of the advertising revenue?

          • Paul Rain

            I hear Patrick got fired, you could start by submitting an article?

    • Paul Rain

      Brah. It’s just a MAC11 with some boltons. Not sure if this is still the cheapest MG you can get, but it’s not far of.

      Probably cheaper than buying most semi H&K rifles.

      • PK

        $6k for a M11/9 is a fair to middling deal these days.

  • Needs additional controls so it can be fired from the hip because reasons.

    • noob

      You can reach the spade grip thumb trigger from the hip. A laser pointer would be nice on the barrel jacket, to be activated with your support hand

  • Tom Currie

    With a 71 round drum and a 1600 rpm rate of fire, the entire drum would last 2 2/3 SECONDS — absolutely totally useless in any realistic scenario.

    • Amplified Heat

      More useful than the usual 30round-or-whatever stick mags those MACs came with (not disagreeing with you). Factory cyclic was ‘only’ 1200rpm or so IIRC

  • Cymond

    971D? A FAL/MAC hybrid feed by Suomi drums?
    Sounds like a modified version of the MPA 971. Like this but full auto, spade grips, and barrel jacket. https://uploads.disquscdn.com/images/bf62bcac81d6ca9e534220706ee9335a0a9a7cadf06ec3b807f5976c77ad162f.jpg

  • Wolfsbane

    This is just begging to be mounted on a motorcycle sidecar.

  • Triforce

    All my guesses were spot on aside from FAL receiver and the type of spade grip.

  • TheNotoriousIUD

    My name is Rusty Shackleford.

  • Phillip Cooper

    “What this gun can be used for?”

    ENGRISH! You speak it!

    (jesus, guys- try the “grammar” function in Word. PLEASE. )