This guide details how to identify Canadian-made Colt M4 carbines, often manufactured by Diemaco (Colt Canada), which are appearing on the civilian surplus market. The video, presented by an expert with high authority in small arms history, highlights key visual and internal differences from US-made Colts, including specific markings, forge stamps, barrel specifications, receiver finishes, and gas key staking. These rifles are distinct and sought after by collectors due to their unique heritage and manufacturing variations.
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