The LS Self Timing Muzzle Brakes are designed to be a plug and play option for any pre-existing threaded barrel.  They are made from 17-4 pre-hardened PH stainless steel.  The ports are designed to be a perfect balance of maximum recoil reduction without directing the harsh muzzle blast back to the shooter. 
 
There are two size options of the muzzle brake, to help best match your barrel size.  The small brake weights 4.4 oz and has a diameter of 0.95", while the large brake weights 6.8 oz and has a diameter of 1.1".