Platform Mk4 Mk9 Mk17 MkGs – Caliber 9mm – Operating System Fixed Ejector Radial Delayed Blowback – Barrel Length 16.1 – Barrel Twist 1:10 – Barrel Contour MT – Barrel Material 4140CM SBN – Muzzle Device CMMG ZEROED Muzzle Brake – Muzzle Thread 1/2 X 28 – Upper Receiver Billet 6061 T6 Aluminum – Hand Guard CMMG EML15 M-LOK – Finish Cerakote Standard – Charging Handle CMMG ZEROED Ambi – Weight 4.0 lbs – Length 25.3