Homebuilt Magpul Folding PDW – FMG9

A very talented builder over at AR15.com is constructing his very own Magpul Folding Machine Gun (FMG9). Using an airsoft platform, a Glock slide, a nine inch barrel and a mill, “RDTCU” was able to build a fully functional PDW. I’ll let his details and pictures speak for themselves:

Finally had some time to work on [the FMG], should be getting close to a test fire, maybe in the next couple weeks.

Magpul PTS shell/frame
G17 slide
Lone Wolf 9″ barrel, shortened
Polymer80 front locking block, lugs welded up and re-profiled
Standard Glock trigger/sear assembly in a steel rear insert
Trigger bar welded up and re-profiled for the folding trigger

Working on a stronger carry handle from a chunk of leftover delrin, already slotted it to slide on the rail. It will still come off easily but will have have better sights than the little nubs on the original and will have an integral light instead of using a separate rail-mounted one. It’s way too tall right now, the finished product will be much shorter.

FMG9

As a reminder, Wikipedia has a brief history of the FMG9:

The Magpul FMG-9 is a prototype for a new generation of folding submachine guns, designed by Magpul Industries in 2008. Like other folding machine guns, it would be used for concealed carry and can be disguised as anything from a small package to an extra laptop battery. It is made out of a light-weight polymer material rather than metal, making it very light and easy to carry. It is also small enough even to fit in the back pocket of most everyday pants. It was developed for potential use by personal protection details such as the United States Secret Service. As of 2014 Magpul has indicated no intention of bringing the prototype to production.

Magpul FMG9 on Ultimate Weapons:






Pete

LE – Science – OSINT.
On a mission to make all of my guns as quiet as possible.
Pete.M@staff.thefirearmblog.com
Twitter: @gunboxready
Instagram: @tfb_pete
https://www.instagram.com/tfb_pete/


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  • forrest1985

    Nice dog!

  • Bigbigpoopi

    I wish they made a semiauto version. Maybe when we repeal OAL laws?

    • Beardrdrambler

      “they” don’t make any version of it.

    • noob

      this handmade full custom firearm one is semi auto. it has glock trigger parts.

      • RDTCU

        Yeah, semi-auto only, and it’s a registered SBR.

        • gunsandrockets

          How well is that See All Sight working out?

          • RDTCU

            I like it better than irons on such a short sight radius, and it doesn’t need batteries.
            I’ll be stuffing a flashlight into the charging handle underneath it.

          • Flounder

            You sir, are amazing.

    • Wow!

      Well the solution is to make it yourself. If you absolutely need to comply with illegal laws, you could try to get your own shoulder brace approved. (Note how the stock/cover is inherently U shaped)

  • Nicholas C

    I have the KWA FMG. I have always wanted to do this. I should Form 1 and make an SBR.

    • Green Hell

      I used to have KWA Kriss Vector, this thing is super strong and high quality for an airsoft, think you could legit put a real firearm inside it’s polymer reciever. https://uploads.disquscdn.com/images/f01d6f14cd61d79f58601529cfaa95eb90bb9625935fc7430d101e830220694a.jpg

      • Nicholas C

        I have that too. I swapped the plastic housing for real Vector polymer housings.

        • Green Hell

          Not sure why would you do that, but okay.

          • Nicholas C

            I had spares. The KWA plastic housings are ABS plastic and brittle. Plus it makes my airsoft look and feel closer to my real steel setup.

      • Wow!

        Personally I would make a new Vector from scratch if you are going to do that. The KWA airsoft gun is already a desirable item of it’s own, I’d rather have a vector clone that doesn’t quite look like a vector than to potentially mess up a top noch airsoft gun.

        If you do make your own vector, what I personally discovered is that the inherent weakness in the design is the delayed blowback notch cut into the bolt carrier. You have to be really careful not to cut it too deep (where you get lots of failures to fire or out of battery situations due to the carrier not going all the way up and consequentially pushing the bolt all the way forward). If you want, you can almost omit it all together and just add a little more weight to the bolt carrier. The 45 degree angle of the carrier slot already acts like an inertia delay as is. The curve of the rails inside can be formed by bending 0.25″ diameter barstock and welding them onto a 16 guage sheet metal flat which bolts together to kind of sandwich all the parts. The trigger group is basically an upside down closed bolt MAC trigger group. Also since you are making this from scratch, make mag release bars that stretch out to the trigger group to make reloads a heck of a lot faster as if it is an AR. A vector is significantly a lot more work than a normal blow back firearm, but once you know what to do, it shouldn’t take you more than 8-10 hours to make your first one and no more than $75 in materials (if you have to buy full lengths of the sheet metal and barstock and can’t get cutoffs or scrap from someone).

    • Flounder

      You would be my hero if you did that. I am bookmarking that dudes thread and seeing if it is at all possible for me to recreate. Probably not at the moment but a guy can dream!

    • PK

      If you need a step by step on it, come on over to NFA Talk… the hardest part, these days, is getting the FMG shell.

      • J. gM

        I could not find anything about the FMG.

        I am really interested in finding out how to disassembled the slide from the Airsoft magpul housing

      • Wow!

        If you can’t get the airsoft frame, you can always make it yourself. Fold on a hydraulic press or vise and spot weld (I suggest 16 guage) sheet metal. The latch can be done a lot of different ways not just how magpul does it. It ends up looking identical to the Stoner FMG but can look completely different on how you dress it up.

  • b0x3r0ck

    Do they make a version of this for the maxima 9.

  • noob

    Hmm…. 22tcm9r anyone? It could be a very viable pdw for a truck driver or helicopter pilot. Although, without a trigger guard, you would be very cautious about not sweeping your adorable doggos with it while cleaning it.

    • RDTCU

      He tries to be the center of attention… It was non-functional at that point, it’s got the full trigger guard back on now.

    • Jared Vynn

      I would love a 22tcm(9r) pdw, but you would need a delayed blowback design because of the high pressure and high bolt thrust.

      • RDTCU

        They’ve been running 22TCM in converted Glocks for a while now. I could do it in this thing with a barrel, some springs and maybe a lighter slide.

        • Jared Vynn

          Glocks are delayed blowback though which is why I see a lot of possibility with this. For the cost a CAA Roni would be easier to do though.

          • RDTCU

            Absolutely, but I’ve never been about “easy” 🙂

          • Jared Vynn

            The more difficult it is the more satisfying it is to complete.

            Always good to see more 22tcm stuff as well, I’ve seen someone do a p226 from an 80% kit in 22tcm on Facebook. Unfortunately the ar15 and pdw from modern weapon systems is dead.

          • Twilight sparkle

            Glocks aren’t delayed blowback, they’re short recoil operated.

            Unless armscore changed a lot of stuff for their conversion kit

          • Jared Vynn

            I used the wrong terminology, but the gist is the same.

            Because the Glock action being used 22tcm could work unlike if a straight blowback was used as rather than trying to extract the case when pressure is too high it is retarded for a few Ms until the barrel and slide are unlocked. This achieves a similar function as delayed blowback.

  • Adam W

    I’ve got a converted one as well. It was a machine gun, but the selector switch and slide were kept by the previous owner. I’ve got a slide, but I don’t want to order the barrel and do all the paperwork. Probably should just sell the damn thing.

    • LGonDISQUS

      I’ll buy it. Feel free to email me

      la la hs gh ost at ya hoo dot com

    • Twilight sparkle

      You know it’s really easy to get caught on a lie when it come to firearms…

      • Adam W

        Hahaha I mentioned it’s for sale so I can sell it. Shoot me your email and I’ll send pics 🙂

        • Twilight sparkle

          You do realize you can post pics here right?
          No the issue isn’t with the fact that you could have a converted fmg airsoft gun, those aren’t that uncommon. The issue is with the term “machine gun” what you’d have would be a post 86 dealer sample that wouldn’t be that easily transferred from one party to another. So if you do have an fmg airsoft body then the previous owner likely lied to you about converting it.

          • iksnilol

            But IIRC the FMG uses a Glock slide. So it isn’t unrealistic that the previous owner had a FA Glock slide in it.

          • Twilight sparkle

            Or a glock sear kit, but finding one of those is less likely than finding someone that converted an fmg… and the two things together are statistically improbable

          • Adam W

            The sear kit is hardly uncommon. With demo letter they run less than $400

          • Twilight sparkle

            They can run less than that if you pick up an 80%
            The combination of things you mentioned just seems really unlikely but not impossible.
            The person you bought it from would have to have a class 7 license for manufacturing and a type 2 sot to deal with NFA items (plus Itar taxes) and then there’s the business of getting a pts fmg airsoft gun and converting it which has only been done a handful of times
            I’m thinking that this person you bought the gun from having gone through that much trouble to have a class 7 ffl and a type 2 sot would have at least included a slide with the gun
            It sounds to me like that person found out that converting it was a lot more trouble than they originally thought and they decided to sell it incomplete because “it was a machine gun”

          • RDTCU

            Given the amount of work it takes for a functional conversion that won’t fall apart quickly, that is the more likely scenario…

          • Adam W

            It wasn’t a full auto slide. It was a full auto sear/selector in the slide. He is a class 3 dealer and thus sold it to me without the slide and selector because that’s obviously bad news.

          • Twilight sparkle

            Are you sure he ever got it working? And manufacturing under a class 3 is a bit of a no no isn’t it?

          • Adam W

            With a sear the registered part is the sear. If you put it on a glock or in a fmg the registered part doesnt change. There is no ‘manufacture’ to worry about. Once you take the sear and slide out of the chassis it isn’t a NFA item until you put something else in. Like a slide and under 16″ barrel for an sbr

  • gunsandrockets

    Cool!

  • roguetechie

    Damnit RDTCU!

    finish the PDR .. Argghhhh!!!

  • LGonDISQUS

    *Note* The airsoft guns are going for $3-400used on ebay.

    I once spent an entire weekend emailing UK, JP, and HK stores that had listings on their site to determine whether they actually had one in stock. 108 emails later….. nothing.

    • PK

      If you can find one of the shells for $300-400, buy it. Last one I saw went closer to $1,000.

    • RDTCU

      Yeahhh, I got mine from MilSig in Canada from their last pallet of new guns.
      I sold off the Airsoft parts to recoup some of the cost.

  • pun&gun

    Ugh, I wish these were not NFA regulated. This seems like the perfect car gun.
    The owner’s little comparison SBR is a nice looking firearm, too.

  • PK

    He’s not the only one to have built one. We have a discussion on it over on NFA Talk, too.

  • Marty Ewer

    I always wanted to do this to the FPG I have. As soon as I have the time, I keep telling myself. LOL (Shocking what they go for on ebay these days.)

  • iksnilol

    Where’d you get the shell? How’s the airsoft component holding up? Was it expensive?

    • RDTCU

      MilSig in Canada, last production run of the FPG, so yes it was a little on the pricey side. No issues so far, the internals have all been replaced.

      • RDTCU

        Sold off the Airsoft internals and replaced with Glock components and machined steel rails.

        • Tchaa

          WELL, small world. I think you’re the one who grabbed one of the last ones, had one set aside for myself luckily XD

          Though, I’m curious. The KWA/PTS FPG had one occasional failure point from all the broken ones I’ve seen, that being the point where the rear latch hooks onto to hold the upper “shroud” in place. I’ve seen a few of them with the rear bit of the upper shroud broken off, mostly due to guys being a bit aggressive when they open up the FPG from its collapsed position… Did you do anything to reinforce that bit? Used one of your pics to highlight the spot.

          PS. If anyone’s wondering, sold off the last of that FPG batch sometime around last December. Its been discontinued for quite some time but there’s the occasional FPG that will pop up from time to time.

          https://uploads.disquscdn.com/images/f7763fa561aff33f45c4a663aa98f34c57005b465df9cb88df96f50b870ab3e0.jpg

          • RDTCU

            Not yet, but i plan to make a new latch that is extended to the rear on top so that it is captive by more than the tiny loop inside the top cover. Whatever may fail can be remade one way or another 😀

          • noob

            I wonder if a binary trigger on this would be interesting…

      • J. gM

        Yes I got one from MilSig when they were at 600 $ later the price was 1,000 $.

        I never figured out how to remove the “Glock” slide from its housing.

        Just out of curiosity, no real intent to fit in a real Glock in there, but I would really appreciate an explanation on how to remove the slide.

        Regards

  • Phaedrus

    What is that AR-like PDW thing next to the FMG?

  • Mike Costello

    Unimpressed dog is unimpressed.

  • gregge

    I want to see someone convert an old NES Zapper to a working .22LR pistol.

  • RDTCU