The Angstadt Arms MDP-9 is an ultra-compact subgun chambered in 9mm and fed with Glock pistol magazines. It has a proven roller-delayed action and AR-15 platform compatibility. It features 1913 Picatinny rail; QD sling sockets; M-LOK interface; ambidextrous forward charging handle; flared magwell; extended magazine release; threaded bolt catch screw; B5 Systems Type 23 pistol grip and last round bolt hold open on an empty magazine. Accepts Glock 9mm double stack magazines. The MDP-9 is compatible with most aftermarket 9mm PCC triggers. Includes two 27rd Magpul PMAG GL9 magazines.