Compensators have been around for a while, and they are only becoming more popular as time goes on. Hiperfire's Hipercomp Next Gen compensator screws onto 1/2 - 28 muzzle threads and is made for 9mm Luger firearms. The ports on this muzzle device work to redirect the gases released when you fire to help control the amount of recoil that the shooter feels. The Hipercomp Gen 2 is compatible with M9 and M10 bayonets and is the same size as the standard mil-spec A2 flash hider.Hiperfire Hipercomp 9mm Next Gen Compensator Specifications and Features: Hiperfire Item Number: HPC9MMG2 High Performance Recoil Muzzle Compensator Caliber: 9mm Luger Muzzle Thread: 1/2 - 28 UNEF RH Same Size as MIL Flash Hider M9/M10 Bayonet Compatible Best in Class Recoil Reduction Crush Washer Included Installs with MIL Armorer's Wrench Weight 2.4 oz