Equipped with a 5 barrel this BANSHEE is one of the shortest 9mm pistols CMMG� offers. What sets this BANSHEE apart is the Mk17 platform lower which is designed to use Sig Sauer P320/M17/M18 pattern magazines. Being able to use handgun magazines in a pistol caliber carbine or personal defense weapon allows shooters to use their existing collection of magazines mag pouches and other accessories. - Platform Mk17 - 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 Compensator - Muzzle Thread 1/2 x 28 - Upper Receiver Billet 6061 T6 Aluminum - Lower Receiver Mk17 Forged 7075 T6 Aluminum - Hand Guard CMMG EML4 M-LOK - Finish Cerakote - Charging Handle CMMG ZEROED Ambi - Pistol Grip CMMG ZEROED Pistol Grip - Buffer Type Carbine - Receiver Extension Pistol Tube - Trigger Type ZEROED Drop-In - Trigger Guard Integrated - Safety Selector CMMG ZEROED 60/90 Degree - Magazine Sig Sauer P320 21rd - Weight 4.5 lbs - Length 20.8