![]() For this reason, these types of BCGs are preferred for sporting competitions. Semi-auto BCGs have an extra cut at the bottom of the tail which increases the cycling rate. Most BCGs on the market today are full-auto ones. In fact, all that means is that the BCG is a bit heavier, which actually increases the reliability of the carrier. This whole process involves high pressure, high temperature and a lot of moving parts, making it easy to understand why the reliability of the AR15 largely depends on the design and durability of the BCG.ĭifferent types of Bolt Carrier Groups (BCGs)Įssentially, bolt carrier groups can be separated into 3 main types:įull auto (or M16-style) BCGs are designed to be used by military and law enforcement but they don't automatically make a rifle automatic. The gas released in the process spins the bolt inside the carrier, meaning another round is ready to be fired. The BCG is the part responsible for loading a new bullet into the chamber, firing that bullet with the help of the firing pin and then ejecting the spent casing. But what exactly is a BCG and how does it function? Everyone with an even passing knowledge of the AR-15 platform knows that the bolt carrier group is one of its most critical components. ![]()
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