The TBRC M&P Micro Comp is threaded in the standard 1/2×28 thread pitch. Therefore, It will work on most 9mm M&P barrels threaded in that pitch, including most 40-9 conversion barrels! The Micro Comp only adds about .50″ to the end of your threaded barrel (this will vary based on the spec of your barrel). Comp mitigates recoil and keeps your gun flat throughout recoil. Version 2 Micro Comp has a beveled front face to aid in holstering and material added to the rear face to help close up the gap on barrels with longer threads and shoulders.
This comp is to be installed with red loctite only. There are no set screws involved with installation of the M&P comp due to the size of available threaded barrels.