When modularity, affordability, and quality are all important the Mk4 T is the upper of choice. The Mk4 T introduces CMMG's RKM series of KeyMod free float hand guards. This upper sports an 11" RKM hand guard and a nitrided 4140 CrMo steel barrel in a medium taper profile.
- Upper Receiver: Forged 7075-T6 AL M4 type
- Barrel Length: 16"
- Barrel Contour: Medium
- Barrel Material: 4140 Chrome Moly Steel
- Muzzle Thread Pattern: 5/8"-24
- Chrome Lined: No
- Barrel Finish: Salt Bath Nitride
- Twist Rate: 1 in 7"
- Chamber: 300 AAC Blackout (7.62 x 35mm)
- M4 Feed Ramps: Yes
- Muzzle Device: A2 Flash Hider
- Gas System Length: Carbine
- Gas Block Diameter: 0.750"
- Handguard: CMMG RKM-11 Mid-Length, Free Float
- Sights: None
- Bolt Carrier Assembly Included: Yes
- Bolt Carrier Type: Mil-Spec
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.