So, let me say that I put a 40 round clip in the gun and pumped 20 rounds through it rather quickly. It worked fine. I have one more question to ask in order to learn more about the AR. So, my understanding is that with the jet screw missing, the gun was operating in the beginning with the least amount of pressure possible with that particular gas block. Is that correct? Keep in mind that it has not been shot much at all. I am surprised that it worked at all with nothing there to control gas pressure except the hole.