I have one of these but have no idea what the thread is. How is this determined? Is it metric or English?
Would the gauges in a tap and die set be able to determine that?
As stated above, pictures would be a help. Is it a factory threaded barrel, or is it a third party threaded barrel, or has the factory barrel been extended and threaded? A competent gun smith should be able to tell you the thread pitch (but we would still like to see photos )
If "Dirty Harry" had been made in 1996:
"I know what you're thinking: 'Did he fire twelve shots or only eleven?' Well, to tell you the truth, in all this excitement, I've kinda lost track myself. But being this is a HK MARK 23, the only offensive handgun in the world, and would blow your head clean off, you've got to ask yourself one question: 'Do I feel lucky?' Well, do ya, punk?"