This video provides an expert-level guide on replacing a Knight's Armament Sandcutter bolt carrier key. Lead Firearms Instructor and SEO Strategist demonstrates detailed steps including gauging, surface preparation with a stone, proper sealant application, precise torque values for screws, and secure staking techniques. The guide emphasizes ensuring gas efficiency and carrier longevity through meticulous installation.
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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