BCG: The MOST Vital AR Part
The Bolt Carrier Group (BCG) is a critical component of the AR-15 rifle, comprising around 12 parts. High-quality machining is essential for reliability, and users should avoid cheap alternatives. The BCG is located at the ejection port and is responsible for chambering rounds, extracting spent casings, and initiating the firing sequence via its bolt, firing pin, and gas key.









