If you're looking for one of the best Bolt Carrier groups you can get, the this Battle Arms M4/M16 BCG is for you. The BCG is full auto cut making it heavier and less prone to bolt bonce that slows your rate of fire than a normal AR-15 cut. This gives the rifle a more controllable and reliable aspect. Made out of hardened steel this BCG is then precision machined. The entire BCG is coated in a Black Nitride Finish.

Specifications and Features:
Bolt Carrier: 8620 Steel Case Hardened
Firing Pin: 8740 Steel, Center-less Ground, Hard Chromed
Gas Key: 4130 Steel with Grade 8 Screws, Properly Staked, Machined from Billet
Cam Pin: 4340 Hardened Steel
Finish: Black Nitride
Bolt: 9310 Steel, Cased Hardened, Shot Peened, Mil-Spec Dimensions, CNC Ground After Heat Treat
Extractor: 4340 Steel, Manganese Phosphate Finished for Positive Grip