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CMMG MK3 .308/7.62x51mm Complete 18" Upper Receiver 38BCC38

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  • 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.


Additional Information

Part #38BCC38


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