You may have to give me some slack since I'm unsure I know what I'm asking here. If I go to a gunsmith and tell him I want him to put a new aftermarket barrel on my action, does he buy a blank and then chamber it himself? Or does he buy the pre-fit? What is the difference, expenses aside, in my buying a pre-fit barrel and installing it myself? I noticed that Shilen, for instance, says their pre-fit barrel chambers are cut 15% longer and that the customer has to have a 'smith cut the shoulder for the correct headspace. Where is the "buy the tools and do it yourself" in that. Any enlightenment here would be appreciated.

Pete