I have a 870 made in 1991 with around 2 - 3 thousand rounds through it and the action bar on the LH side (ejection side) is looking worn where the little groove is cut in it. I think the groove is for the shell stop but I am not to sure. The wear is mostly just the blueing but there also looks like they might be a small (very small) chip worn into the sharpened groove.
What is the purpose of this sharpened cutout?
Is wear normal there?
Should I buy a new action bar tube assembly?
Or is this something that is common and nothing to worry about since it still functions normal?
Hope this helps. Let me know if you need further........