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What is a Bolt Carrier Group, and what is its purpose? An  AR-15 bolt carrier group (BCG) is the removable assembly within your rifle that houses the critical components of the firing mechanism. Simply put, it's the "group" responsible for operating the firing pin, extractor, ejector, and other essential parts of your firing system. Among these, the extractor rod is one of the most crucial elements, ensuring spent casings are removed adequately after firing. Also referred to as the "e …