The Faxon MuzzLok Ported Flash Hider gives a unique look to your rifle while reducing muzzle signature. Faxon's invented "Muzzlok" feature on this device allows for easy timing and installation of your device without the need for a crush washer or shims. By using the extension nut to adjust the length of the device, you can adjust the rotational timing. It is recommended that you tighten the device to the recommended torque specification of 20-25 foot pounds. By not having to overcome the resistance of the crush washer, this allows devices to be removed and reinstalled in the field if desired. FeaturesNo crush washer neededAttach and remove in the field Time your muzzle device quickly and easily