Why did you take a dirty gun to your gunsmith in the first place? To me that's like going to the dentist without brushing your teeth first. I wouldn't have blamed the guy for either telling you that you'd have to clean it before he'd work on it, or clean it himself for a fee (because gunsmiths do not clean guns for free) before any other work commenced. I don't blame the guy for giving the gun back dirty when it came in dirty. He probably oiled it down to keep it from rusting in his shop. Better oily than rusty, right? As far as thebolt shroudgoes, he probably replaced it because he considered it a safety issue and wouldn't return the gun unless it was fully repaired and safe to shoot. In our excessively litigious society, I couldn't blame him for covering his butt in that regard, lest you take the unrepaired gun, blow your leg off, and sue him intoahomeless shelter.
The next time before you take a gun to a 'smith you might want tokeep two things in mind: 1)A gunsmith willNOT clean a gun forfree, and if you take a gun in dirty, expect to get it back dirty and, 2) don't take a broken gun into a 'smith and expect it to come back unrepaired.
Good luck finding a gunsmith that will clean your gun for free and won't charge you for repairs.

Mike