Due to the limited barrel, the CAR-fifteen SMGs suffered from a loud and bright muzzle blast, and numerous muzzle units were produced to cut back this. The SMGs were at first fitted With all the conventional M16 rifle's "duckbill" or 3-prong flash hiders, which didn't ease the problem. In September 1966, Colt developed a 3.5-inch (89 mm) lengthy m