Due to the quick barrel, the CAR-15 SMGs endured from a loud and bright muzzle blast, and several muzzle devices were created to reduce this. The SMGs had been originally fitted Using the regular M16 rifle's "duckbill" or three-prong flash hiders, which did not ease the condition. In September 1966, Colt designed a 3.5-inch (89 mm) extended modera