Well gentleman, and all other pronoun people, I have a small snafu. I have an unused Bartlein new barrel for a CZ 457. I can't get the thing together. The shank is VERY Tight . Bartlein said to heat up the receiver, and put the barrel into the freezer. The problem is this: I want to be able to set the headspace for a tight lockup, but if I have to freeze the barrel and heat up the receiver, it is going to be a bear to take the barrel out to put shims to set the headspace. It has the barrel grub screw cuts. There is not a gun smith close to me to get this barrel and action put together correctly. I need a smith to get this barrel and receiver together correctly. I need some recommendations as to a decent smithy to do just one little job. I don't feel comfortable heating and freezing parts to get them to go together for a rimfire CZ...........as always, thanks for your kind support ! I have Fedex Hub near me.....and my local FFL has changed hands since the Feds confiscated the license. I can ship. I have contacted a guy that advertises on line, but I have never heard back from him.