Accuracy is why our S-7 Compensator is not just a "Muzzle Brake" Our line of Compensators are produced here in the USA on some of the highest quality CNC Machines. All of our Compensators are manufactured Cartridge specific. Our S-7Line consists of the S-7A line is for Tactical rifles like the AR-15, AR-10, the AK-47, and the Ruger Precision (and like bolt action rifles) Our S-B/V line is manufactured for Bull or Varmint Profile Barrels. Our S-7T/TR line is for Sporting / Hunting Profile Barrels. Finally, Our S-E "Eliminator" Series is manufactured primarily for Competition shooters, however they do perform quite well on AR-15 Pistols and SBRs.