NOT KNOWN DETAILS ABOUT XM177E2

Due to small barrel, the vehicle-15 SMGs suffered from the loud and bright muzzle blast, and numerous muzzle gadgets were designed to cut back this. The SMGs were being originally equipped While using the conventional M16 rifle's "duckbill" or 3-prong flash hiders, which didn't relieve the challenge. In September 1966, Colt designed a 3.five-inch (