CMMG Mk4 Upper Reciever (55BA142)

For AR15 riflesBillet 7075 T6 Aluminum, Cerakoted Armor Black CMMG's Upper Receiver Assembly is made from forged 7075 T6 AL, and ships with dust cover and forward assist assembly installed.

Fits an AR15

Bolt: 9310 Steel, Phosphate FinishExtractor: 4140 Steel, Phosphate Finish CMMG prides themselves on flawless workmanship so every part purchased will function flawlessly and the CMMG AR15 Bolt...

Complete Mil Spec M16 bolt carrier groupExtractor is 4140 Steel, Phosphate FinishCarrier is 8620 Steel, Chrome Lined, Phosphate Finish This CMMG 5.56 Bolt Carrier Group, Black (55BA419) is a...

USGI Magazine Upgrade KitSpring and FollowerAnti-Tilt FollowerTriple BraidedSingle The CMMG Spring and Follower Kit, SS Anti Tilt, Triple Braided comes with everything you need in