The 10/22 4-Prong Flash Hider is designed to fit on a standard-profile Ruger 10/22® barrel. Fully compliant with State and Federal laws, it is not just a cosmetic accessory that creates the ultimate Tactical look – it actually will do the job. Requiring only the removal of the front-sight post from the OEM barrel, the all-metal Flash Hider slips into place, and is secured by a small pin (supplied) that engages the OEM dove-tail.