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 existing holster or majority of holsters on the market. On full size or any size pistols, consider it as also a thread protector with added muzzle control. Made from AISI 1144 steel bead blasted with Quench Polish Quench (QPQ) process finish, the Strike Micro Threaded Comp - CIRCLE is small and lightweight at only a total length of 16.3mm (0.64”) while redirecting gas for recoil reduction to keep you on target.