I was talking to a friend of mine who is a retired machinist at the gunshow yesterday about doing an ex sniper. He said that he wouldn't do them anymore as he had broken too much carbide tooling trying to drill and mill out the welded in screws. Said that if you broke a bit or mill you had lost what you would have made on the job. As the guy's have said some aren't a problem and some will make you pull out your hair. I've got a PE that I'm about afraid to start on...