Following the adoption of the Sig Sauer P320 as the M17 and M18 by the US military shooters all over have been asking for a pistol caliber carbine that uses P320 mags. Not only can you switch magazines from BANSHEE to handgun seamlessly you also retain full AR15 functionality in the Mk17. – Platform Mk17 – Caliber 9mm – Operating System Radial Delayed Blowback – Barrel Length 8 – 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 EML7 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 Integrated – Safety Selector CMMG ZEROED 60/90 Degree – Magazine Sig Sauer P320 21rd – Weight 5.3 lbs – Length 23.7