Best gas piston upper hands down - SIG SAUER Sig516 Gen 2 Upper Receiver Assembly Complete

So I have purchased a handful of these uppers once I got away from DI AR’s I have dedicated one to putting it through hello . So far so good. 7500 rounds and so far not one failure. Only maintenance I do is to clean the barrel for break in and keep the bolt oiled with Lubricant (Lubra Silk). Not even a light strike and I have fed it the cheapest Ammo I can find especially in a shortage.