This video details the assembly of an AR-15 Bolt Carrier Group (BCG) by Larry Potterfield of MidwayUSA. Key steps include accurately measuring firing pin protrusion using specialized gauges and calipers, ensuring it falls within the .028 to .036 inch range. The process also covers correctly inserting the bolt into the carrier with the extractor oriented, installing the cam pin to allow free movement, and securing the firing pin with its retainer pin.
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