Here's what I would do: Contact this fellow and see if you can buy these for a bit less, he's had them on for months and they've not sold:
(You need to Login or Register to view media files and links) That would give you one set of replacement parts.
I would then take one set of parts that has mushroomed out, peen, file and sand them back into shape, and send them off to be case hardened. Should cost less than $100 to have that done.
Expensive lesson in buying cheap the first time, but a survivable lesson. At least you stopped shooting them before the breech blew open. That has happened to others with these Pedersoli's.
I had one of the early Pedersoli's that had a similar problem, plus a couple of other problems. I got similar response from the U.S. Rep, and have gritted my teeth ever since when he came on these boards and extolled the virtues of buying Pedersoli's at a lower price than Shiloh's. Between mediocre barrel, bad crown, ill fitting wood, soft hammer and block, ill fitting dovetails, poor barrel blue, unattractive case color, non-functional extractor, brass trigger guard that was too tight for disassembly, and poor resale value, a good custom on an original or an American made Shiloh would have been a real bargain.
I like rolling blocks, but shoot originals.
dave