This flash hider is designed to replace the standard M14 flash hider and sight assembly. Simply remove your stock flash hider / sight assembly, reinstall your stock sight post onto our mount, and install the new assembly onto the barrel. Used in conjunction with our Phantom 7.62 Q.D. Sound Suppressor. It retains the excellent flash hiding capabilities of the original Phantom. This flash hider WILL NOT accommodate our 5.56 Sound Suppressor. (Sight base does not fit models with 18.5″ or shorter barrels).