NOT KNOWN DETAILS ABOUT XM177E2

Due to limited barrel, the CAR-15 SMGs experienced from the loud and bright muzzle blast, and numerous muzzle units ended up made to scale back this. The SMGs had been initially fitted Along with the common M16 rifle's "duckbill" or three-prong flash hiders, which didn't reduce the challenge. In September 1966, Colt created a three.five-inch (89 m