Of the couple of hundred Series 80's to come through our shop I saw one...ONE that wouldn't fire. Why, you ask? Somebody installed an aftermarket trigger and didn't check if the firing pin plunger moved sufficiently to allow the gun to fire.
One out of hundreds. That one wasn't the fault of the Series 80 system.
We built comp guns out of the majority of those 1991's, and they went back to their customers with the Series 80 gear intact. Customers shot them for years in USPSA with no problems.