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In the early days of the American involvement in the Vietnam conflict, the selective-fire Colt Model 601 proved itself on the battlefield, with gruesome reports from the field on the .223 Rem. and the early ARs 1:14” twist on the battlefield. The gun used by Special Forces and indigenous troops early in the war was very different from the rifle adopted as the U.S. M16A1. Learn more in this "I Have This Old Gun" segment from a recent episode of American Rifleman TV.
