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Good luck. You might want to ask for photos of the parts before they're fitted.

Looking at your photos again, I'm sorry to say, but what I can see suggests a lot of very worn parts; worn out in some cases. Massive erosion on the bolt face from primer leakage. Burrs extending...

All the deformations or peen marks won't help, in fact in my experience such things do a very good job of jamming close-fitting parts together.