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My gearbox is giving me all sorts of problems ever since I upgraded it. I have no idea why as the only upgrades I last did were a new gear set and mosfet. My problem deals with fps though. Problems First the cylinder to piston and cylinder to cylinder head air seal was terrible but that is mostly fixed and I changed the spring too but it is only shooting 360 fps and the spring is an m120 so it should be shooting hotter than 360 fps. When I test the gearbox without the barrel, the air is powerful. When I pressed the hopup to the gearbox and turn it upside down to do the air nozzle to bucking seal test, the air does blow out into the mag well but I have to hold the barrel just right, other wise it seals fine. After the test I sanded the tappet plate to fix the problem, but instead I got the same exact fps AND now the bbs feed horribly as if the air nozzle is too far forward, blocking the bbs. I only have $30 to spend on amazon (because it is a gift card) on upgrade parts. All help is appreciated. Thanks.