Revolutionary SIG SAUER system enables quick and simple attachment of suppressor to firearm. Taper-Lok Fast-Attach System with Muzzle Brake optimizes alignment” improves accuracy” reduces point of impact shift and doesn’t require any shims. Taper-Lok mount is also extremely simple to install” transforming an hour project into a 5-minute job. This muzzle brake self-centers the firearm and suppressor” which reduces group dispersion. It has a low profile yet is effective at reducing recoil and works best on SIG Taper-Lok-shouldered barrels” but is also backwards compatible with traditional” 90-degree shouldered barrels. Please check with your local and state municipalities for any further regulatory requirements. It is your responsibility as the buyer of these components to make sure you comply with all NFA rules and applicable laws.