Good idea to lube your action bars yet you should check each bar for friction wear they are wearing evenly. I had to straighten more than one bar on a Rem 870 to assure the bar was straight and not binding on the back stroke. Also lube the around the barrel extension that fits into the barrel. This area is a friction point, the the top of the Rem 870 receiver is thin so lubing this area eliminates unnecessary wear.
Doc
