Parker and hale silencers have been made long before going back as far as the war. As for the finer thread, a bad idea, reason easy to cross thread a finer thread. The next thing we will have is another wag making another thread size. The only reason for another thread size and to make it standard is to to make one, and only one that will fit the smaller barrels like the Titan models or Steyr barrels which you have to use a push fit adaptor with grub screw.