I used a pair of calipers and it measured 13/32 or about .40. I dropped a .390 roundball down the removed barrel and it stopped at the threads. It didn't roll back out when I tipped the barrel. I think that's what I'll use for now.
This site uses cookies to help personalise content, tailor your experience and to keep you logged in if you register.
By continuing to use this site, you are consenting to our use of cookies.