This guide details the examination of a 1967 Colt SP-1 AR-15, focusing on its eligibility for Curio & Relic (C&R) status under US federal law. It covers identifying key markings, receiver features, barrel stamps, bolt carrier characteristics, and buffer systems, providing insights into the evolution from the M16. The information is presented with the authority of a firearm historian, highlighting specific technical details relevant to collectors and legal status.
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