I have a KelTec P15 that is shaving primers.
Each primer strike shows firing pin drag - I'll attach a picture at the end.
The firing pin is round, the slide hole is round.
The shaving is to the side of pin strike, so it doesn't appear to be primer flowing into the firing pin hole.
In my mind, the dragging & shaving is happening when the slide/barrel unlocks a bit early.
A further clue is that I get a fair amount of crud in my magazines - more than I'm used to seeing with other pistols running this ammo. "Fair amount" means that I have to disassemble and clean the magazines every 300 rounds or I'll get malfunctions. No bulged brass.
Original recoil spring assembly - 600 rounds on it. It is a double spring captive affair.
The primer shaving gunks up the firing pin channel and eventually causes light primer strikes. The P15 is a pain in the butt to disassemble/reassemble.
I'm hoping someone can impart some wisdom on locked-breach designs that will help me understand the primer drag & shaving - hopefully something simple.
