Was trying to remove barrel but from PSA PA-10 and I think I broke the indexing pin. At first I was using just a barrel but wrench, then added heat, then added breaker bar to wrench. And then the whole thing turned. I was using a reaction rod type tool and though it's not recommended I figured I'd give it a shot, oh well. At least it's PSA's cheaper 308 barrel. Guess I'll clamp barrel in vise now and try to remove barrel nut.