CMMG 55DC70A Barrel Sub-Assembly 5.56x45mm NATO 16.10" Black Nitride Finish 4140 Chromoly Steel Material Midlength with Medium Taper Profile for AR-15 Shotshell Buckshot Loads injection molded mag follower &

injection molded mag follower & mag spring formed from heat treated chrome silicone wire

castle nuts

The Browning X-Bolt Smoked Bronze Picatinny Rails are all designed and manufactured with precision to fit your firearm with the industrys tightest manufacturing tolerances

The concaved contour provides the user with comfort while the adjustable dual belt loops optimize ride height and cant

CMMG 55DC70A Barrel Sub-Assembly 5.56x45mm NATO 16.10" Black Nitride Finish 4140 Chromoly Steel Material Midlength with Medium Taper Profile for AR-15 Shotshell Buckshot Loads injection molded mag follower &CMMG's Barrel Sub Assembly is ideal for building your custom AR 15 upper group. It comes with properly installed M4 barrel extension.