Great flash hider - Wilson Combat Accu-Tac Flash Hider

This flash hider is simple and effective. It does not need a crush washer or measured torque as it just needs to be snugged to about 10Ft/Lbs since it is self tightening by design. They do recommend using anti-seize when installing. It does ship with a crush washer, but that is in case you want to go back to your old muzzle device since you probably removed and should discard the old one. BTW, for other Sig owners, soak your Sig muzzle device in hot water for 30-60 minutes to get the Rocksett Sig uses to soften. Then your old device will come right off. Heat has no effect on Rocksett. It is water soluble. The hot water just speeds up the process.