First of all get a new hop up unit all together. Preferably a good make like madbull or promethius. Secondly you might have problems with your air nozzle not being able to retain air or should i say push air. It seems like you have a leak somewhere in the whole system. Might be a piston head nozzle or both. Preferably reopen the gun and dry fire it without the barrel on the gun. See if theres a leak somewhere. Maybe even relube everything and put it back together. First things first though get a new hop up unit. Glueing the piece back together isnt going to help much. Also check if the piston and so on that generate air are all in the propper place and all your o rings are propperly lubricated. If that doesnt work take it to a professional. Tell them what the problem is and theyll help you with it.
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