Due to the quick barrel, the CAR-15 SMGs endured from the loud and bright muzzle blast, and many muzzle equipment were designed to lower this. The SMGs were initially fitted Along with the conventional M16 rifle's "duckbill" or a few-prong flash hiders, which did not relieve the situation. In September 1966, Colt produced a three.5-inch (89 mm) pr