Last week I returned a Gen 3 0.22 cal DAR that I bought last September because it suddenly lost 250 fps in velocity. That gun had less than 100 pellets through it. Yesterday, I got out my Gen 3 0.25 cal DAR that I also bought last September. The first 15 or so shots were fine. I then topped it off to 3000 psi and shot it and immediately noticed a drop in velocity. After about 8 or 10 shots it seemed to be back up to shooting normally. I decided to air it back up and shoot a string over the chrony. I found that the first 6 shots gradually increased from 530 fps to 725 fps which was at a gauge reading of 2900 psi. The next 30 shots were 725 fps or more with a maximum of 780 fps with pressure of 2900 down to 1600 psi. Shots 36 to 50 dropped from 725 down to 510 fps. So, I thought maybe 3000 psi is too much pressure for some reason so I filled it up to only 2600 psi thinking that would be in the sweet range but wouldn't you know, it did the same thing with the first several shots being low on velocity. To top all this off, during doing this , the gun decided to randomly dump ALL the air and now it has a slow leak which it didn't have before. This is supposedly a regulated gun, I didn't think regulated guns had this bell shaped velocity curve?? Could this be a bad regulator? bad o-rings?