01-06-2013, 11:20 PM
4140 is very nice to machine Ed, I think you'll like it. If you are used to machining low carbon steels, you'll find that most tool steels will machine yield a much better surface finish, they just take a bit longer to machine. The barrel for my Steven's is 4140 pre-hard (Rc32) and I've never used that before. Hopefully it won't be too painful.
Tom
Tom