I had a PSG1 a couple of years ago. I had it upgraded to shoot 450fps w/ .20 bbs, tightbore, and all that jazz. It was a cool gun, but I feel it wasn't very skirmish worthy. If I had to do it all over again I would have gotten an SG1 and made a MSG90 out of it. The PSG1 gearbox action leaves a bit to be desired. While neat and all, normal gearbox action is far more reliable which makes it more suited to actually playing with in a game IMHO.