Chopper92

it advertises as no more bb spills but that's a lie, 1 or 2 still drop but significantly less than less than normal drops (5-6)

the hop up needs to be for a umarex ump, so the hop up is a bit of a bugger, similar to the g36

your nozzle or tappet plate may be a bit long.....

try placing some electricians tape at front of gearbox to effectively push hop away and allow nozzle to clear thus allowing bb's to enter hop. keep eye on fps as you may lose a little seal if you go too mad