Built on the capable and proven Mk4 AR15 platform this BANSHEE comes with the shortest 9mm barrel CMMG® has to offer making this the most compact 9mm AR that utilizes our 9 AR conversion magazines. – Platform Mk4 – Caliber 9mm – Operating System Radial Delayed Blowback – Barrel Length 5 – Barrel Twist 1:10 – Barrel Contour MT – Barrel Material 4140CM SBN – Barrel Twist 1:10 – Muzzle Device CMMG ZEROED Linear Comp – Muzzle Thread 1/2 X 28 – Upper Receiver Billet 6061 T6 Aluminum – Lower Receiver Mk4 Forged 7075 T6 Aluminum – Hand Guard CMMG EML4 M-LOK – Finish Cerakote Standard – Charging Handle CMMG ZEROED Ambi – Pistol Grip CMMG ZEROED Pistol Grip – Buffer Type Carbine – Receiver Extension CMMG 6 Position Fastback Extension – Stock / Brace CMMG RipBrace – Trigger Type ZEROED Drop-In Single Stage – Trigger Guard CMMG ZEROED Trigger Guard – Safety Selector CMMG ZEROED 60/90 Degree – Magazine CMMG 9ARC 30rd – Weight 4.7 lbs – Length 20.8