tsuru,
I wasn't worried about scratching up the cylinder (since nobody would see it anyway) until you mentioned the story of the cylinder scratching. So I'm gonna have to look for somebody or some place with a drill press to let me use.
I'm pretty familiar with gun upgrading from playing in high fps games in Philippines, but I still agree with all of Greylocks' advice. I would not pay somebody to upgrade my baby though. That way if something goes wrong, I don't have to point fingers, cos the only one to blame would be myself.
