The CMMG Mk3 Upper Receiver is a complete upper receiver assembly, with BCG and charging handle chambered in .308 Winchester and able to shoot both .308 Winchester and 7.62x51mm NATO loads.
This upper comes equipped with an 18” barrel. This barrel length will ensure a thorough powder burn, giving the projectile adequate velocity to be effective. The barrel is formed from 416 stainless steel and is contoured with a heavy taper for maximum rigidity, thereby increasing accuracy potential. The 18” barrel length and heavy contour make this upper ideal for target shooting or hunting from a tree stand, as well as several other applications, such as tactical shooting and just having fun. For enhanced projectile stabilization, the barrel has a 1:10 twist rate. This means that the rifling in the barrel will impart a complete 360 rotation of the projectile per every 10 inches. The rifle is drilled for a rifle length gas system.
The majority of the 18” is covered by the CMMG RKM15 Hand Guard. This hand guard is compatible with KeyMod mounted accessories and features full-length KeyMod slots along the 3, 6, and 9 O’clock positions on the rail. These KeyMod slots allow you to mount any KeyMod compatible accessory to give you maximum versatility. The top of the rail give you a continuous Picatinny MIL-STD-1913 rail. This top rail is an excellent mounting surface for optics, lights, lasers or any other rail mounted accessory.