Sootch00 Rifle Review: CMMG Mk57 5.7×28 AR-15
The CMMG Mk57 5.7×28 AR-15 uses the Patented Radial Blowback Bolt to reduced felt recoil and add reliability. Flat Shooting and accurate, it’s a pleasure to shoot at the range. Related Videos: SootchZone Build: Complete CMMG Lower Build CMMG Mk57 5.7×28 AR-15 SPECIFICATIONS CALIBER: 5.7x28mm BARREL: 8” 1:9 Twist, Medium Taper 4140 SBN MUZZLE: A2 Comp, threaded...
