BudsGunShop.com - Full auto BCG vs standard BCG
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What are the differences between a full auto BCG and a standard BCG?
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Joe, a Full Auto Bolt Carrier Group has more mass. The difference between the two BCGs is the presence of a full auto lug. The bottom portion of the BCG has a lug that contacts the sear release in a full auto trigger groups and allows the gun to fire in fully automatic. Details with pictures here : thetruthaboutguns.com/ask-foghorn-whats-difference-between-full-auto-semi-auto-only-ar-15-bolt-carrier/