I'm thinking about buying a 4" GP and then maybe switching the barrel out on my 6". I toyed with the 4" tonight and the barrel length is great. The gun balances so much better. Can I buy a barrel for it and then just swap it out? If I can't what is the easiest way to cut it? Is it possible to cut it at the end that attaches? I've never removed a barrel and I'm not sure what the scoop is.