Revolutionary SIG SAUER system enables quick and simple attachment of suppressor to firearm. Taper-Lok Fast-Attach System with CQB Flash Hider 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. Taper-Lok CQB Flash Hider self-centers the firearm and suppressor, which reduces group dispersion. CQB Flash Hider is low profile yet effective at reducing muzzle flash. It 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.