For those looking to balance carbine-length ballistic performance with the maneuverability of a compact AR pistol this CMMG® BANSHEE Mk4 chambered in 5.56mm is ready to run. Designed to provide everything you need and more in an AR15 this BANSHEE is built on the ultra-modular Mk4 platform. – Platform Mk4 – Caliber 5.56x45mm – Operating System Direct Impingement – Barrel Length 12.5 – Barrel Twist 1:7 – Barrel Contour MT – Barrel Material 4140CM SBN – Barrel Twist 1:7 – Muzzle Device CMMG ZEROED Linear Comp – Muzzle Thread 1/2 X 28 – Gas Port Location Carbine – Gas Block 0.750 Non-Adjustable – Upper Receiver Billet 6061 T6 Aluminum – Lower Receiver Mk4 Forged 7075 T6 Aluminum – Hand Guard CMMG EML11 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 Magpul 30rd PMAG – Weight 5.9 lbs – Length 28