Factory 30-round polymer magazine for the MPA Defender, the standard feeding device for a 9mm MAC-pattern host.

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Masterpiece Arms MPA Defender Pistol Magazine 9mm Luger 30 Round Black 1 Pack Polymer 30RD
This is the factory MasterPiece Arms 30-round polymer magazine for the MPA Defender in 9mm, the standard feeding device for the platform and the one to buy spares of. The Defender is a MAC-pattern gun with the magazine well in the grip, and it runs on MPA's own magazine rather than a Glock, Colt, or MP5 pattern stick.
Buy more than one. A forced reset trigger cuts split times dramatically, and a 30-round magazine empties in a hurry once the reset is doing the work. Two or three spares is the realistic minimum for a range session with an FRT installed.
The 5.7x28mm Defender uses a different 20-round magazine and the two are not interchangeable. Match the magazine to your host's chambering.
Add the MasterPiece Arms MPA Defender 30-Round Magazine (9mm) to your build and see how it enhances your platform.