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Angstadt Arms MDP-9

When the MDP-9 was first mentioned, there were a lot of negative comments about how it was the same gun Angstadt Arms was already producing. We can now tell you that the big changes are under the hood.

Featuring a true roller-delayed blowback design, Angstadt Arms’ MDP-9 offers low recoil and compatibility with suppressors.

It’s ultra-compact and lightweight, just 14” long and 3.6lbs (empty). It’s also designed to use Glock magazines and features last round bolt hold open and an extended mag release.

The gun incorporates a non-reciprocating forward charging handle that can be swapped from left to right side. The barrel is from an MP5 K (5.85″) and has a 3-lug. All other parts in the upper assembly are proprietary to the MDP-9 (including trunnion, bolt, rails, etc.).  

It’s backwards compatible. The monolithic upper assembly can be dropped on an AR-9 or AR-15 lower receiver. For customers that want to upgrade their existing guns, they can purchase the upper receiver assembly. It will include the rear picatinny rail adapter to close the gap and allow for brace mounting options.

Goodbye buffer tube! The MDP-9 has a super slim 1913 end rail that can accept a wide variety of pistol brace and rifle stock options. The supplied images show the MDP-9 pistol with no brace as well as with a SB Tactical side-folding 1913 brace. You can also use the telescoping MPX PSB. The MDP-9 upper assembly has receiver cuts to accommodate the rails.

User serviceable. The bolt, rollers, locking piece and rails are made from hardened steel and can be swapped out by the end user. The upper receiver assembly is 7075-T6.


• MDP-9 9mm Pistol: $2,599 MSRP.
• MDP-9 9mm Pistol with SB-Tactical side folding brace: $2,799 MSRP.
• MDP-9 monolithic upper assembly and end rail adapter: $1,799 MSRP.

6 Responses to “Angstadt Arms MDP-9”

  1. Alpha2 says:

    Sounds promising but a bit pricey.

    • Sommerbiwak says:

      Delay mechanism or cheap. Pick one. The engineering, the manufacturing costs nearly as much as fully locked action. The pistol ammuniton makes it possible to cheap out on materials to a degree. and low production numbers of course also raising the price. Thus it costs about as much as a rifle.

  2. Eric says:

    I can appreciate the small market niche this is filling. The ability to go on AR lowers is a smart move, I wonder if that means it can use different magazines such as Colt smg style or the quarter circle 10 MP5 lower.

    • Sommerbiwak says:

      Isn’t there also an ar-15-ish lower receiver that takes UMP magazines? with either that or the MP5 style lower this is the modernized MP5 that H&K should have brought to market already.

  3. Pete says:

    The price is breathtaking, but not that far outside of comparable roller locks. The weight is impressively light, great mesh with 9mm. Also like the use of the MP5K barrel. Smart move.

    • Sommerbiwak says:

      Is there going to be a MP5 length with about 9″? An MP5k looks cool and has its place, but the fullsize MP5 is much better to shoot.