I need sum advice. I took in a Rohm 22, model 66 from a friend to clean it up and check it over. He ask me to try and find a mag. Cylinder and I'm finding that to be impossible. So this brings me to my question. Would it be safe to drill out the cylinder to exept 22 mag. From everything I've read this gun was not very well made. The barrel says 22 mag but the cylinder says 22 Lr. So is drilling a bad ideah or ya think it will be safe.