The AR-15 Bolt Carrier Group (BCG) is crucial for the firearm's operation, performing eight distinct functions including firing, unlocking, extraction, and chambering. Understanding its components like the carrier, gas key, firing pin, cam pin, and bolt is essential for maintenance and selection. Variations exist from Mil-Spec to enhanced and competition models, with material choices like 8620 steel for the carrier and Carpenter 158 for the bolt impacting durability and performance.
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