MGI’s MARCK-15 Hydra Vipera SMG 9mm Pistol Now Available

MGI, makers of the modular AR-15-based Hydra rifle, has now made available a pistol version in 9mm. From the press release:

MGI’s MARCK-15 Hydra Vipera SMG 9mm Pistol Now Available and Shipping

Old Town, Maine (October 2014) MG Industries, manufacturer of the modular MARCK-15 AR “Hydra” platform, is pleased to announce that the long awaited Hydra Vipera 9mm SMG Pistol is now available and shipping. Just as modular and versatile as the full grown Hydra, this pistol variant packs a big punch in a small package.

Incorporating MGI’s Quick Change Barrel (QCB-D) Upper Receiver and Modular Lower receiver with a 7.5″ barrel, this pistol will meet all defensive needs. Firing 9mm ammo from standard Colt style magazines, this Hydra variant, made from Mil-Spec 7075 aluminum, comes with all Mil-Spec internal parts and a life time guarantee.

Like most configurations of the Hydra, this weapon ships to you in a standard, hard-sided, lockable pistol case.

The MARCK-15 Hydra Vipera 9mm SMG is the first and only truly modular pistol that can convert into multiple calibers in just minutes. Designed by an industry innovator and Veteran, the MARCK-15 Hydra Vipera is the obvious choice for individuals wanting more caliber choices on one platform. The MGI Hydra Vipera 9mm SMG has a suggested retail price of $1289.00

For more information, visit or your local retailer. Retailers, contact MGI to find out more about carrying the most modular rifle system in the world.

MGI Hydra Vipera 9mm SMG Pistol Specifications:

Caliber: 9mm

Overall Length: 24 inches

Overall Height: 7 inches

Overall Width: 2.5 inches

Barrel Length: 7.5 inches

Weight: 5.5 lbs.

Magazine Type/Cap: Colt style magazines

The Hydra rifle and pistol both seem like good guns for the AR-15 enthusiast who doesn’t want to have to own several rifles to be able to shoot many different calibers or configurations. It makes a good deal of sense for MGI to want to enter the brace-driven “rifle-derived pistol Renaissance”.

Nathaniel F

Nathaniel is a history enthusiast and firearms hobbyist whose primary interest lies in military small arms technological developments beginning with the smokeless powder era. In addition to contributing to The Firearm Blog, he runs 196,800 Revolutions Per Minute, a blog devoted to modern small arms design and theory. He is also the author of the original web serial Heartblood, which is being updated and edited regularly. He can be reached via email at


  • Asdf

    Isn’t 5.5lbs a bit light for a 9mm AR pistol? You gotta get some mass into that bolt and buffer or the thing is going to beat you to death.

  • USMC03Vet

    So many rails. Must resist urge for vertical grip….

    • SP mclaughlin

      There’s gotta be a creative loophole, like an “unintentional” stock such as the Arm Brace. Maybe a giant laser or torch that you can grip somehow?

      • Steve Truffer

        Make sure the gun is >26″ long. Still no stock, but you can have a vertical.

        • Cymond

          yeah, but even with a KAK tube, you still need a 10.5″ barrel to get over 26″ overall length, and this pistol only has a 7.5″ barrel.

          • Steve Truffer

            Do the math. This configuration is 24″ long. It needs 2 inches. the KAK brace tube offers a sufficient collar for a brace, that the minimum will be met.

          • derfelcadarn

            PISTOL ?! 26 inch long 9mm, I can think of multitudes of 9mms doing this better. Just what problem is this an answer to ?

          • Cymond

            I would agree with you if we were talking about something like semi-auto MAC clones. However, the receiver extension tube makes these AR-15 pistols much more like shooting a rifle. It doesn’t “shoulder” very well, but at least you can grip it with 2 hands apart (not together) and get a cheek weld. Combined with the option to easily mount a red-dot sight, the AR-15 pistol has a greater effective range than the typical pistol.

            I do agree that it would be more effective in a rifle cartridge, if that’s what you mean. However, it would also be heavier and louder, too.

      • Cymond

        Bipods (not the GripPod) are fine on a pistol.

    • Zachary marrs

      Afg’s are legal

  • Will

    The M&P Shield would be a perfect companion for a Hydra.

    • A.g.

      Marvel fan ?
      I like.

    • FourString

      They could market it as “good to be evil” like Jaguar

  • echelon

    Since it’s modular and $1,300 I’m guessing I can also switch it to use Glock mags too, right? Right?

    • Camilo Emiliano Rosas Echeverr

      Sure, if you buy the 250$ replacement magwell

  • BryanS

    Sounds like SMG, but cant be SMG because of 1986…….

    • Could be a dealer’s sample. 😉

      • BryanS

        Not to be flippant.. but most people don’t care about that, since its unlikely we will ever get hands on one outside of youtube 🙂

        Photo still shows only fire and safe, or are my eyes that bad?

  • Rusty Shackleford

    It’s difficult to get excited for this or the Lone Wolf when the Quarter Circle 10 has all the right features. Small Frame and Large Frame to fire all calibers, LRBHO, Glock feed ramp, self-centering ejector and an upper receiver tension screw slot.

  • ghost

    My other concealed firearm is a 12 gauge pump. For those chilling 60 degree nights when I might need a jacket.

  • RV

    This is a serious question. What is the point of this design? Why not just use a standard pistol or carbine? Sure it looks cool, but what does this design provide that a Glock 18 or Beretta 92 does not?

    • Cymond

      The ability to use optics, as well as the ability to get 3 or 4 points of contact as opposed to one point on a standard pistol.

  • derfelcadarn

    Another fine example of just because you can does not mean you should.

  • big daddy

    I have an excellent and fun to shoot 9mm AR. The older DDLES lower, CMMG upper with 8″ cut barrel, Vortex hider, Yankee Hill carbine rail, SIG brace and it’s a great gun. I’d use it for HD with HST 147 +P rounds, no flash, no recoil. Bent a bolt catch firing hot ammo so I went with a Wolff HD spring. It’s heavy a bit now because of the 9mm buffer that weights a lot. Add the mag and 32 rounds and it does get a bit heavy which is fine, it has almost no recoil even with the hot 127 +P+ Ranger T loads. Qcircle10 is making the DDLES lowers now and coming out with a lot more stuff for the 9mm and .40 AR. Also is the Bazooka gas operated .45 AR……..yeah a gas operated .45 AR, now that’s what I want. The only issue with the AR45 is the M3 grease gun mags. They need to come up with a double stack .45 30 round magazine. The M3 mags are very longand heavy, I know I carried one in the Army.

    • Cymond

      I think M3 magazines are double-stack, and here’s a modern made 30-round M3 magazine.

      If you were referring to magazines for a conventional handgun, Kriss makes an extension for 45ACP Glock magazines that increases the capacity to 30 rounds, but they are not cheap!

      • big daddy

        I don’t remember them being double stack, the .45 is a fat little girl. Those mags where long and heavy. Newer ones, I have read are having issues with the thickness of the finish and some being out of spec. I read that a few years ago and do not have any experience with them. The army ones I used where from pre-Vietnam war make, that was 30 years ago. It might be more like 2 years until I pull the trigger on a AR45, especially if the Ace rifles/pistols come out.

        • Cymond

          Yeah, they’re fat, but if they’ll fit double-stacked in a Glock magwell, there’s no reason they wouldn’t work in an external magazine. Besides, if the mags were single-stack, we’d be talking about a magazine that’s half an inch wide but at least 2 feet long just to hold 30 rounds. Check out this pic of a 15-round magazine for a 1911. However, apparently the M3 magazines are single-feed, so more like a typical pistol than like an Uzi or AR-15 double-feed magazines. In other words, single-stack feed lips with a double-stack body.

          FWIW, the KeepShooting brand magazines claim that they measured hundreds of GI magazines to get an average size. However, I haven’t tried them or looked for any independent reviews.

          “I am sure you know all about the horrors associated with USGI M3 magazines, most of which stem from a poor single-feed design. Not to mention, there are not too many USGI M3 magazines that are even the same. Well, we put these concerns to rest by taking precise measurements on hundreds of USGI M3 magazines to come up with an average with which to use in the design of our magazine. These measurements affected everything from the width of the feed lips and the degree of the follower to the location of the magazine release engagement and the overall dimensions. We also enhanced several components, including the follow, the spring and the interior of the body while deburring and polishing all surfaces for a smooth operation – I am talking smooth as butter. The result is what we believe to be the best M3 Grease Gun Magazine on the planet, one that functions in any firearm designed to accept an unmodified M3 magazine.”