This video provides a detailed physical inspection of an AIM Surplus Bolt Carrier Group (BCG). The instructor, from School of the American Rifle, meticulously disassembles the BCG, checks for proper fit and function of components like the firing pin, cam pin, gas rings, and extractor. The inspection includes checks for magnetism, bolt protrusion, headspace, and a borescope examination of the carrier's three-bore. While generally positive, the review highlights a minor machining inconsistency in the carrier's rear three-bore, potentially affecting gas efficiency.
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