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Bryant Ridge's Analysis: The Colt AR-15 SP1 is a historically significant rifle that closely mirrors the original military-issued M16, designed for the civilian market in a semi-automatic configuration. Chambered in .223 Remington, this model features a 20-inch chrome moly barrel with a 1:12 twist rate—ideal for stabilizing lighter 55-grain projectiles, consistent with the ammunition used during the Vietnam-era service years. Finished in anodized black, the SP1 sports classic design elemen …