My S&Ws are used. I cannot confirm stock triggers, hammer, firing pin, springs, etc, but the side plate screws do not show signs of being turned/boogered. I'll check the strain screw on each Smith to be sure.
The SR9c is stock.
The CZ85 was returned to the Kansas City 15-18 months ago for new springs and a checkup. No mods were made.
The Kahr CW9 is stock.
I noticed the problem initially with the Wolf primers in my SR9c. I had read about Wolf being hard, so I tried them in my CZ thinking being hammer-fired instead of striker-fired might (somehow) make a difference. Nope. My Model 15 had the same problems. In all three guns, I would experience a 3-5% failure rate, although one package had 8% failure and one 11%. (By comparison, this Monday, the failure rate was almost 19% (15/80).)
Second strikes would usually, but not always, light the primer. If it didn't go on a second strike, further attempts would never set it off. Monday, I think I had two fire on a second strike.
Previously, the situation was analyzed as having high primers. I was encouraged to seat firmly and deeply (as I said, someone said "crush setting", whatever that is) and make sure primer pockets were clean and free from residue. So, I've checked primer pockets and seated slightly below flush.
It's supposed to cool off this weekend. Maybe I can get a couple hundred loaded up and get out there and try.
One positive about this - trying to put the best construction on this mess - is that a failure-to-fire lets you see any flinch very fast - same principal as loading a snap cap.
Q