Drop in replacement BCG for you AR15 rifle. Polished before and after black nitride finish. Features the following:
-Enhanced 9310 Steel Bolt
-8620 Tool Steel Carrier
-Mil-Spec Extractor Spring
-Tool Steel Extractor
-Mil-Spec Gas Key 4130 Steel, properly staked with Grade 8 hardware
-Will work with .223 / 5.56 / 300 BO
-MPI Bolt
-Will work with your FRT Trigger