Peter, the CZ custom shop is a gunsmith operation, off premises to CZ. I'm not sure if they do all the building of CZ guns here, but do not believe they do so for all models marked "American". Is that what you are saying?

Obviously the so-called custom shop CAN do good work as some has been posted here. And maybe they can fix bigboar's problems, particularly the .458's ills. But that .505 seems like it needs more than TLC.