This is a Angstadt Arms Bolt Carrier Group known as the AR-15, model AA09BCGNIT.
This 9mm bolt carrier group is compatible with both GLOCK and Colt style 9mm AR-15 magazines without any further modifications. It features removable weight for use with the Law Tactical folding stock adapter.
Features:
For Use with a Standard AR-15 Hammer
QPQ Black Nitride Finish
Machined from 8620 Alloy Steel
