Forged M4 upper receiver is T marked and has M4 feed ramp cuts
Semi Auto bolt carrier
Mil-spec .250 diameter take-down pins
Barrels are engraved CMMG MPC 5.56 NATO 1:9. Each upper is head
spaced and test fired before shipping. The upper is built off of our
standard forged A3 receiver with M4 feed ramps. The barrel is our 4140
steel, Bull Barrel profile, 5.56mm chamber and bore and 1:9 twist ratio..
The upper includes a low profile gas block and free float tube.
