I bought a new to me Nagant revolver on INGO earlier in the year. When I took it out, every shell was a dented primer, no ignition. The owner hadn't fired in 20+ years, so I'm totally happy with the purchase, no fault on them. They were decent dents, not just a ping. Thinking new firing pin on the hammer and new main spring. Anything else I should be looking at or replacing? I'd rather put in $50 in parts then guess check.