This Gemtech flash hider is the culmination of user feedback, extensive testing, and decades of experience. It is more aggressive than ever to cut down on carbon build-up in the suppressor and to prevent it from getting stuck. Included is a precision mounting shim kit.The new Gemtech flash hiders are the culmination of user feedback, extensive testing, and decades of experience. The new flash hiders are more aggressive than ever to cut down on carbon build-up in your suppressor and to prevent it from getting stuck. All 5.56mm Quickmounts fit the M4-96D, G5, G5-T, SHIELD, HVT-QM, QUICKSAND and one suppressors. The New Gemtech flash hiders are the culmination of user feedback, extensive testing, and decades of experience. The new flash hiders are more aggressive than ever to cut down on carbon build-up in your suppressor and to prevent it from getting stuck. Features: Increased size of 3/4 inches wrench flats for installation Blank firing adapter (BFA) groove for increased silencer options and training Extended area behind lugs for use on short barrel rifles Overall length of 2.4 inches for use on 14-1/2 inches barrels (pre-drilled for pinning) Precision mounting shim kit included Built-in carbon cutting grooves Quick mount lugs for use with all GEMTECH 5.56mm and 30 cal suppressors