I snagged an early 870 Police to use as home defense tool and then started to research them and found out that I have the one with the early shell carrier that could cause a jam that would render it useless. I tried to cause a jam by short stroking and could not get it to happen. I have owned 870's in the past and had one that did jam sometime and another one that was good to go. Should I be worried about the early early shell carrier ?