You asked and we listened. Available with a 10.5 barrel this is the shortest 5.56mm BANSHEE CMMG® has ever offered and makes for a great choice for anyone looking for a compact backpack/truck gun in 5.56mm. If capability is what you’re after then worry no more; Built on the Mk4 platform this BANSHEE AR15 lower receiver group will work with any standard AR15 pattern upper group as well as all of CMMG’s conversion magazines (w/ matching upper group). – Platform Mk4 – Caliber 5.56x45mm – Operating System Direct Impingement – Barrel Length 10.5 – 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 EML9 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 5.5 lbs – Length 26