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 Resonator and Phantom .30 Cal. Q.D. Sound Suppressors. It retains the excellent flash hiding capabilities of the original Phantom. (Sight base does not fit models with 18.5" or shorter barrels). This flash hider WILL NOT accommodate our 5.56 QD Sound Suppressor. Thread Pitch: .595" (19/32) Length: 3 inches Weight: 5.536 Oz The devices should be torqued to between 20 and 30 Ft-lbs.