The AR-15 Bolt Carrier Group (BCG) is the heart of your firearm’s operation, playing a vital role in the cycling process that makes semi-automatic fire possible. This critical assembly contains essential components like the bolt, cam pins, firing pin, and gas key, each working reliably in unison to chamber, fire, extract, and eject rounds. Regarding … Continue reading AR-15 Bolt Carrier Groups Explained: Key Functions and Design