is the narrow dark ring around the firing pin hole considered bolt face erosion? Is this from leaking primers? or is this normal after firing? This isn't my bolt, I found this pic on another forum.
If it is actually a groove It is from a continued diet of hot loads and/or loose primer
pockets.( very bad ).
By the looks of the bolt, cleaning is in order and then inspection. It might be primer seal
from shooting military ammo that has built up over time due to improper cleaning.
If it is just a build up of the primer seal (It's like fingernail polish) then it just needs cleaning
If it is erosion it has gone to far and should be replaced because of continued overpressure
loads that could have over stressed the bolt. This condition is NOT normal and should be
stopped for safety purposes.
J E CUSTOM