The H&R Retro 635 9mm Pistol is bringing the 80s back! Styled after the original AR SMG, it's compatible with all Colt-style magazines, though ASC and Metalform are recommended. This pistol features the H&R "HAR-15" Pistol brace, which keeps your retro build compliant while maintaining the classic aesthetic. FeaturesH&R "HAR-15" Adjustable Pistol BraceSlick Side 9MM Upper Receiver1:10 Twist Rate, 1/2X28 Thread Pitch9MM A1 Birdcage Muzzle Device