This video provides a detailed autopsy of a Knights Armament Sandcutter AR Bolt Carrier Group (BCG) that was causing reliability issues. The instructor systematically disassembles and inspects each component, including the bolt, extractor, firing pin, cam pin, and carrier bore, using various gauges and tools to identify potential problems. The primary finding is a broken gas key fastener, which is identified as the cause of gas leakage and the firearm's failure to cycle.
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