If you want the best an AR has to offer, then the 300 Series is your choice. This AR upper group is fitted with every desired feature including a black hard coat anodized finish that can be upgraded to one of 10 premier Cerakote colors, a CMMG RML4 M-LOK handguard, CMMG ZEROED Ambi charging handle, and a .578×28 threaded barrel with thread protector. Chambered in .40 S&W, this upper group is ready for your next AR build.
40 S&W MkGs uppers are designed to work with MkGs lower receiver groups. Other manufacturer’s lowers may work but we cannot guarantee function or reliability. All of our upper groups come complete with BCG.
All CMMG products come with our Lifetime Quality Guarantee.
**All NFA rules apply** See linked CMMG Resource article for more information.
|OPERATING SYSTEM||RADIAL DELAYED BLOWBACK|
|BARREL MATERIAL||4140CM, SBN|
|MUZZLE DEVICE||THREAD PROTECTOR|
|MUZZLE THREAD||.578 X 28|
|GAS PORT LOCATION||N/A|
|UPPER RECEIVER||FORGED 7075-T6 AL M4 TYPE UPPER|
|HAND GUARD||CMMG RML4 M-LOK|
|FINISH||HARD COAT ANODIZED RECEIVERS AND HAND GUARD (CAN BE UPGRADED TO CERAKOTE)|
|CHARGING HANDLE||CMMG ZEROED AMBI CHARGING HANDLE AR15|