Its not an Auto, its a semi-auto modded, AEG sniper. Your original post specified "nothing" over 400, I just needed clarification on your definition of "nothing".
P.S. I never actually said it shoots 400 with .28's, I only said .28's would get me below 400. It's shootin abouts 430 with .2's right now, I only mentioned .28's because thats the only other weight of BB I have on me at this time, which chronos at about 340. I like them better than .25's cause they're far more accurate, for a relatively small loss in range.
Oh, and its called a PDI 210 that makes it shoot that hot.