I have an upgraded mp5a2 (upgraded to about 370) and it shoots about 65 feet and curves down. I adjusted the hopup and the thing is, when I pull the little lever back a bit so it could curve up, the lever sorta bounces back to the middle. What's the deal?!
P.S. it did the curve down thing before the upgrade too... I thought it would further the length and accuracy, but all it does is curve down in record time.