Tuning up an 870

[MrGiggles]

I ran some shells through it yesterday.. Just low brass stuff busting clays.

The jamming problem is still there. I can visibly see the front of the shell snagging on the bottom lip of the chamber, they aren't being lifted up all the way. If I back the slide up a little and try again they will go.

What parts should I be looking at next?

 

[PapaG]

Break the corner of the chamber and polish. Like tuning a 1911. Could be a sharp lip or burr on the chamber.