MDP-9(R) - The subgun perfected for the modern age. The Angstadt Arms MDP-9(R) is an ultra-compact subgun chambered in 9mm and fed with GLOCK(R) pistol magazines. It has a proven roller-delayed action and AR-15 platform compatibility, making it the ideal personal defense weapon for both professionals and prepared citizens alike. Please note: This is a short barrel rifle variant and requires a tax stamp. Specifications: ACTION: Roller-delayed blowback CALIBER: 9mm NATO COLORS: Black Type III Hard Coat Anodized, Magpul FDE Cerakote & Tactical Grey Cerakote MAGAZINE: Includes two (2) 27 round Magpul PMAG GL9 magazines. Accepts GLOCK(R) 9mm double stack magazines. Please see this page for magazine compatibility. ENDRAIL INTERFACE: 1913 endrail with QD sling socket RIFLE STOCK: Left side folding Lage MFG rifle stock with sling mount UPPER ASSEMBLY: 7075-T6 aluminum monolithic upper receiver assembly with continuous top picatinny rail, M-LOK interface and QD sling points CHARGING HANDLE: Non-reciprocating ambidextrous forward charging handle (can be swapped from left to right side) LOWER RECEIVER: 7075-T6 billet aluminum lower receiver with flared magwell, extended magazine release, threaded bolt catch screw and B5 Systems Type 23 pistol grip LRBHO: Last round bolt hold open on an empty magazine FIRE CONTROLS: Milspec AR-15/M4 Fire control group. The MDP-9(R) is compatible with most aftermarket 9mm PCC triggers. Please see this page for trigger compatibility. BARREL: 5.85? chrome moly black melonite barrel with a 1/10 twist and threaded 1/2x28 TPI MUZZLE DEVICE: Removable 3-lug muzzle device OVERALL LENGTH W/ STOCK COLLAPSED: 15 & 3/4? OVERALL LENGTH W/ STOCK OPEN: 23 & 1/8""? WEIGHT (EMPTY): 4.56 lbs unloaded with no magazine COUNTRY OF MANUFACTURE: Made in Charlotte, NC USA! Patent pending