There are many different thread sizes for moderators that have been in existence for many years including variations of 1/2" dia, 5/8" and up to M28....
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...
No I've not been Tony, I joined the Humberside Shooting Range instead, as it's only about 10 -15 minutes away, Dony is a good hour away. It might be...