This video provides an in-depth physical inspection and gauging of five Colt Bolt Carrier Groups (BCGs) from various date ranges, including M16A1 kits, a Colt H-Bar Sporter, and a Colt Commando. The instructor meticulously examines each BCG for wear, corrosion, and dimensional accuracy using a variety of tools and gauges. The analysis covers critical components like the gas key, bolt tail, extractor, and firing pin, offering insights into the manufacturing tolerances and longevity of Colt BCGs across different generations.
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