Huben GK1 Moderator Adaptor To 1/2″-20 UNF

 Huben GK1 Air Pistol Moderator or Silencer Adaptor To 1/2″-20 UNF

With this adaptor you can easily make your Huben GK1 Air Pistol compatible for any air rifle moderator using 1/2″-20 UNF threads. What, in general, is the industry standard for most air guns.
It comes complete with a knurled thread protection cap.