I just found my lost 15-30 FPS, Unknow to me but probably. know to a few of you, If you hopup does not spring back to the gearbox after every shot, the nozzle will not seat right in the hopup losing a small but noticeable 15-30 fps, I lost the little spring a few months back, I was blaming my low FPS on a woreout m120, but after a few test I got my M4 right in the 356-360 range with .25s compare to the 315-330 I was getting
with no spring!!!! YA YA tell me you knew that before...... Well I am Sharing all my AEG info with all.....When I figure somthing out I will pass it on down!