WALTHER P22 + S&W MP22 THREAD ADAPTER
This is all you need to convert your Colt / Umarex 1911/22, S&W M&P22 or Walther P22 pistol for use with standard 1/2-28 muzzle accessories and suppressors. Comes with thread protector.
Manufactured by Dead Air, Gemtech or SilencerCo (your choice below). SilencerCo Delta adapter part number AC5