If you want to get the full fun value out of your S&W M&P22 Compact handgun by being able to mount any 1/2x28 TPI threaded accessories such as a SUPPRESSOR"" a FLASH HIDER from an AR15 or one of Tactical Innovations' UNRESTRICTED FAKE SUPPRESSORS"" then this is the part that you need. This thread adapter quickly and easily replaces the factory barrel nut with no modifications to the pistol. Tactical Innovations thread adapters are CNC manufactured to precision tolerances from solid steel rod (NOT aluminum) in one CNC lathe operation to ensure exact thread alignment and are hot salt blued to match your firearm. Each retail packaged adapter assembly consists of one adapter and one knurled OD thread protector. If you don't yet have a thread adapter"" you're missing the best part of the gun! Order one now!