When modularity, affordability and quality in a 308 WIN package are all important, the Mk3 K is the upper of choice. The Mk3 K is CMMG’s primary short barreled rifle. The Mk3 K includes the RKM11 KeyMod free floating hand guard. The barrel is a nitrided 4140 CrMo steel, 12.5” long barrel chambered in 308 Winchester. Each upper group includes CMMG’s lifetime quality guarantee.
- Upper Receiver Type: A3 Flat-top
- Barrel Length: 12.5"
- Barrel Contour: Medium
- Barrel Material: 4140 Chrome Moly Steel
- Muzzle Thread Pattern: 5/8" - 24 TPI
- Chrome Lined: No
- Barrel Finish: Salt Bath Nitride
- Twist Rate: 1 in 10"
- Chamber: 308 Winchester
- M4 Feed Ramps: Yes
- Muzzle Device: A2 Compensator
- Gas System Length: Carbine
- Gas Block Diameter: .750"
- Handguard: CMMG RKM11 KeyMod Free Floating
- Sights: None
- Bolt Carrier Assembly Included: Yes
- Bolt Carrier Type: Mil-Spec
- Weight: 7.5 lbs
Please Note: An “AR-15 Pistol” upper assembly has a barrel less than 16” in length. Pistol uppers are only for use on AR-15 pistol lowers and legal Short-Barreled Rifles. Other configurations may violate Federal law.
Please Note: Installation of AR-15 upper assemblies with certain features including, but not limited to: flash hiders, bayonet lugs, and threaded muzzles may violate state and/or local laws.