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As a result of quick barrel, the vehicle-15 SMGs suffered from the loud and bright muzzle blast, and a variety of muzzle products had been formulated to reduce this. The SMGs were at first fitted With all the standard M16 rifle's "duckbill" or 3-prong flash hiders, which didn't ease the situation. In September 1966, Colt developed a 3.5-inch (89 m