To remove the old barrel, I turned a few parts and concocted a mini press. Hardest part was drilling out the old barrel pin. I bulged the old barrel right there and had to drill the rest of the pin out. There is no removable bushing so I turned one to fit the inside of the slide and outside of the new under diameter barrel. Still haven't run any extra rounds threw it yet though. For some reason I can only log on here with my hard to see kindle.