Using a picture posted by another member.
I recently went looking at shotguns and decided on the Remington 870 Security from big 5. When i was examining the chamber i noticed marks/nicks located where the arrow points in this picture
(This is not the exact shotgun, just using a refrence to show where i noticed the marks)
Now i havent been able to find any clear pictures of 870's chambers to see if its normal wear. However, in that picture it does seem like there might be some wear.
Just wanted to hear from some owners of the Remington to see if they too have some wear in that spot. My guess its from breech face slamming when pumping the shotgun