"At this point, I'd just keep running it, if it indeed does work. It's likely only going to wear so much before it "mates" up with whatever is causing the wear."

This. It just looks like over effect from tolerance stacking. Functionality will always trump wear and tear as long as its not to the point that it affects functionality. As long as it goes bang everytime, ejection is decent, locks back after the last round and hits where your aiming you should be GTG. BCGs need to dig in and find their sweet spot in the upper receiver, its steel on aluminum.