Colt SP1 AR-15 Rifle
1971 Colt SP1 AR-15, full left-side profile. Photo property of Eisel Armory. The Colt SP1 was the AR-15 that brought Eugene Stoner’s rifle design to American civilian gun owners. Colt introduced the commercial SP1 in spring 1964 (Model R6000 / AR-15 Sporter), chambered in .223 Remington, as the semi-automatic commercial counterpart to the M16 the […]