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 Enhanced bolt carrier's geometry was designed to reduce carrier tilt and the key bearing surfaces are relocated to increase reliability. 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
Enhanced: reduces carrier tilt and the key bearing surfaces are relocated to increase reliability.
Enhanced Version Not Recommended for VERT Stock System