Well, you have to cycle the mechbox on full auto until you see the nozzle as far forward as it can go. Then you disconnect the battery, shine the light into the loading nozzle and look into the MUZZLE (where the BBs come out to get kills) and see if there is any light coming into the barrel through the hop up at all. If so, good chance it's either you didn't cycle it well enough to get it full forward, or there is a definite airleak in the seal. If the hop up C clip that holds the hop up unit and the inner barrel together is cracked or weak, then the inner will nudge forward when firing making the airleak bigger.
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