This 30Cal. AE brake is designed to work with or without a suppressor. When fired without the suppressor, the muzzle brake effectively reduces recoil and muzzle climb.  The muzzle brake as designed eliminates upward and downward blast while reducing recoil  The brake is constructed of stainless steel and has a 5/8 x 24 thread. The overall length of the brake is 2.150" Comes with a pack of spacer to set the timing, brake with thread protector, short Collar with set screw and installation instructions.