Yeah there is no end of "upgrades" that only serve to separate you from your hard earned money. Quality replacement parts that are in spec are all that are needed. Standard gas rings (single piece are gimmick as my friend Jeep stated) are all you need. Few thousand rounds, but just check them when you clean it. Pull the firing pin retaining pin, firing pin, and cam pin and turn the BCG up. If the bolt falls out on its own, replace the rings.