Hello
I hope that someone can help me with my question.  I have both an ARESENAL SA M7A1 and an Arsenal USA SSR-85C-1.  I shot both today and while cleaning both rifles I noticed that the bolt face on both rifles have pitting on them.  There is a black ring that I can not clean off that is in a circle around the firing pin hole.  The pitting is located on that black circle.

I like to rapid fire both rifles and I have recently been using the "Portuguese" green battle pack ammo.  Although I do rapid fire both rifles, I am meticulous about cleaning and do so after every range session.  The Sam 7 is less than a year old.

Has anyone else experienced this?  Should I be concerned?  Should the bolts be replaced?  [/FONT] Thank you everyone for your help.