The CMMG Mk4 utilizes a standard pattern AR-15 mil-spec forged upper receiver. The upper is made from forged 7075-T6 aluminum with a hard coat anodized matte black finish. This upper includes an lo-profile gas block with a rifle length gas system. Additionally the barrel is a 24" Medium Taper 416 Stainless Steel barrel with a 1:7" twist rate allowing you to maximize the .224 Valkyrie easily out to 1300 yards. Finally the free float hand guard provides you with the modularity you need to mount all of your favorite accessories. Unleash the power with the CMMG Mk4 AR-15 Complete Upper Assembly.

Specifications and Features:
CMMG Mk4 AR-15 Complete Upper Assembly 25BB257
.224 Valkyrie
24" 416 Stainless Steel Barrel with Salt Bath Nitride Finish
Medium Taper Profile
1:7" Twist Rate
CMMG SV Muzzle Device
Barrel Threaded 1/2x28
CMMG RLM14 Free Float Hand Guard
Rifle Length Gas System
Lo-Profile Gas Block
Overall Weight 6.9lbs
Upper Receiver is made from 7075-T6 Aluminum
Hard Coat Anodized Finish
Matte Black

Fits:
CMMG Mk4 or Standard Mil-Spec Pattern AR-15 Lower Receiver's