That's a head-scratcher for sure...If it had been dented OUT, I'd say excessive dry-firing...But dented IN, WTF???
I looked at the breechblock print, the cross section, and that area around the firing pin hole is the thinnest part of the breechface, but I really can't see anything that could dent it in...
The only thing that comes to mind is maybe it was dented out from dry firing and some-bubba hammered it back in...Too far...
If that was true, I would expect the firing pin to not protrude as much as it should...
Great problem! Thanks for bringing it up!
