This makes no sense at all. I have a 308 survivor I have threaded for a suppressor and I finally got my 7.62x39 barrel back from being threaded. I traded for a H&R in 204 and sold the barrel and kept the frame.
I tried my 7.62x30 barrel on it and no go . I know about the problems with mil. surplus ammo. It worked great on my 308 frame not one single mis-fire. Ill be reloading brass rounds for a subsonic round anyway so its not going to be a big problem. Just a little disapointed. top: 308 survivor/ middle 7.62x39/ baby girl's 410

