my serial number is:2600192
got mine last friday...got it second hand..
the guy had played 3 skirmishes with it..i played with it on sunday...no problems threwout the day..
will see how it last in the future..but until now it performs very well
i think the ROF is the same as in a marui Famas...which is quite nice i think..
range and accurancy are the same as on a marui AK47...
maybe you just got a lemon...
//of course it won't work if u use Bioval
chronoed mine with king bio 0,25: 260 fps