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What is a Bolt Carrier Group and its Purpose?A bolt carrier group (BCG) is the removable part of your rifle that contains the operating parts of your firing mechanism. Simply put, it's the "group" that operates the firing pin, the extractor, the ejector, and all other parts of your firing system. The extractor rod is one of the most important parts of your firing system. The extractor rod is also known as the "ejector rod". It is one of the three main rods in your firing mechanism. The ot …