NOT KNOWN DETAILS ABOUT XM177E2

As a result of small barrel, the vehicle-fifteen SMGs experienced from a loud and bright muzzle blast, and many muzzle units were designed to cut back this. The SMGs were in the beginning equipped Together with the conventional M16 rifle's "duckbill" or 3-prong flash hiders, which didn't alleviate the trouble. In September 1966, Colt created a thre