The CIRCLE edition pistol compensator from the Strike Micro Threaded Comp (SMTC) line can work with just about any size slide using a threaded barrel with 1/2"x28 Threads Per Inch (TPI). This simple and sleek CIRCLE design is for those looking for a minimalist sized compensator that still redirects gas to mitigate felt recoil and reduce muzzle rise. SI internal testing has typically seen a reduction average range (dependent on application) of 8-15% in felt recoil. The included O-ring (with spares) is used to help time and retain the SMTC CIRCLE comp. Originally designed for smaller compact, sub-compact and micro sized pistols, the SI styling of the CIRCLE maintains fitment with your Mfg: Strike Industries