Posted March 8, 2019 2:00 pm by Comments

By Matt Sandy

AR-15 Bolt Carrier Group
courtesy Primary Arms

The AR-15 bolt carrier group, or BCG, is a critical and often misunderstood piece of the AR-15/M16 upper receiver. Here I will give a brief breakdown of the BCG’s components, how it works, problems to look for and what to consider when buying. The image below gives nice breakdown of the parts in a typical BCG. We won’t get into […]

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