That liner would definitely be for a US made gun rather than a Spanish or Italian "import" if you are correct about the threads.
My thoughts exactly Rondo!
But....why on earth would I be buying that?
I'm thinking a good deal of ignorance came into play here when that puppy ended up on my bench.
Betcha I got it thinking "that looks like it'll fit" forked over a few bucks and took it home....
Still yet, I don't remember it, that's me story and I'm stickin to it!
Uncle Russ...