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Smyth Busters: Can an AR-15 Fire Full Auto with an M16 Carrier?

Brownells Gun Techs Caleb and Steve are back for a "fact or fiction" discussion about full-auto AR-15 parts, specifically the bolt / carrier group (BCG). The guys explain the difference between a full-auto M16-type BCG and a semi-auto one: the full-auto has a longer shroud on the underside to trip the auto sear. If you drop an M16 bolt / carrier group into your semi-auto AR, it'll shoot full auto, right? NOPE! It doesn't have any of the other internal components needed to operate full auto. (Interesting fact: Brownells sells a fair number of full-auto to semi-auto conversion kits to local law enforcement agencies that receive surplus military M16s through the Department of Homeland Security.) So the notion that installing an M16 BCG and/or a couple other full-auto parts in your AR-15 will turn it into a machine gun is... a MYTH. Busted.

WARNING: Never attempt to disassemble or reassemble a firearm unless you are absolutely certain that it is empty and unloaded. Visually inspect the chamber, the magazine and firing mechanism to be absolutely certain that no ammunition remains in the firearm. Disassembly and reassembly should follow the manufacturer’s instructions.

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