MK107 MOD 2-M Specs: – Operating System: PWS Long Stroke Piston System with 3-Setting Adjustable Gas System – Caliber: 7.62×39 – Barrel Length: 7.75 – Gas System Length: Pistol – Barrel Twist Rate: 1:10 – Muzzle Velocity: 1944 ft/sec – Muzzle Device: FSC 30 – Upper Receiver: PWS Proprietary Piston Upper T6 7075 Forged Anodized – Handguard: PWS PicLok 15.0 Handguard (1.7 width 2.25 height) – Charging Handle: Radian Raptor Ambidextrous Charging Handle