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 choice of 10 Premier Cerakote colors, a CMMG RML15 M-Lok handguard, CMMG ZEROED Ambi charging handle, and CMMG’s SV muzzle brake. Chambered in .300 BLK, this upper group is ready for your next AR build.
The Mk4 platform accepts standard AR15-style magazines, and is the most versatile of the CMMG platforms, especially with the .22 LR, 5.7x28mm (Conversion), and 9mm conversions.
All of our Upper Groups come complete with BCG.
All Products come with CMMG’s Lifetime Quality Guarantee.
TECHNICAL SPECIFICATIONS
PLATFORM | MK4 |
CALIBER | .300 BLK |
OPERATING SYSTEM | DIRECT IMPINGEMENT |
BARREL LENGTH | 16.1 |
BARREL TWIST | 1:7 |
BARREL CONTOUR | MT |
BARREL MATERIAL | 4140CM, SBN |
BARREL TWIST | 1:7 |
MUZZLE DEVICE | COMPENSATOR SV BRAKE |
MUZZLE THREAD | 5/8 X 24 |
GAS PORT LOCATION | CARBINE |
GAS BLOCK | 0.750″ NON-ADJUSTABLE |
UPPER RECEIVER | FORGED 7075-T6 AL M4 TYPE UPPER |
HAND GUARD | CMMG RML15 M-LOK |
FINISH | HARD COAT ANODIZED RECEIVERS AND HAND GUARD (CAN BE UPGRADED TO CERAKOTE) |
CHARGING HANDLE | CMMG ZEROED AMBI CHARGING HANDLE AR15 |
WEIGHT | 4.6 |
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