Have you always wanted to add a silencer or compensator to your GSG or Sig 1911-22? Now you can with the TANDEMKROSS Thread Adapter! These 1911 rimfire pistols comes standard with a barrel nut that can be removed and replaced with this thread adapter with the included factory wrench. Precision machined from high quality Steel and polished to perfection, this is what your GSG/Sig should have come with from the factory!Don't forget, all TANDEMKROSS products are Made in the USA and come with a LIFETIME guarantee!