This Area 419 Hellfire Universal Adapter is part of the Hellfire Modular Brake System. This adapter allows you to use your Hellfire Self Timing Muzzle Brake or Hellfire suppressor mounts on multiple rifles. FeaturesUniversal adapter system allows TOOL FREE use of multiple muzzle attachmentsChange from an ultra effective muzzle brake to running your can in seconds, without tools!Universal adapter uses a taper surface similar to a machine tool for the absolute best alignment with the muzzle threads.Universal adapter is made in one operation on state of the art CNC equipment to guarantee concentricity with the boreUniversal Adapter Torque Spec to barrel is 25 FT LBs Note: The use of Lemishine (or any citric-acid cleaner) or CLR to clean your brake will likely discolor the black nitride, and will void the lifetime warranty of your product.