To Rick F,
I wouldn't worry too much about it. If they have a single person do all the adjusting/hand fitting, they must care about the end result. What does boggle me is the cost involved in doing so, which they are eating. It would be cheaper to give you a brand new pistol. I am the QC manager in a parts manufacturing facility, and I have an idea of what these kinds of things cost.
I assume they will test fire the gun to ensure functionality/safety before sending it back to you. What I would ask them is if they will have someone competent see what kinds of groups the pistol gives AFTER the work is done.
My $.02
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