I have a Tippmann x7 and have used it for a while, atleast 2 or 3 years. I recently have had trouble with the cyclone feed, it will not rotate on its own, but if I manually do it it works fiine. at first I figured it had something to do with a broken seal on the inside so I bought a complete cyclone feed upgrade. After replacing it it still did not work, I am convinced that I put it all back together correctly because I did it so many times. One of my friends told me that they heard some x7's do not run well with hpa, this makes sense because the first time I used hpa on my gun it began to have problems. I was wondering if this rumor is true because I have run out of options to try to fix my gun.