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Due to short barrel, the CAR-fifteen SMGs suffered from a loud and bright muzzle blast, and a number of muzzle units were being made to lower this. The SMGs were initially fitted Using the typical M16 rifle's "duckbill" or three-prong flash hiders, which didn't ease the trouble. In September 1966, Colt developed a 3.5-inch (89 mm) long moderator t