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its probably because the loading nozzle in your mechbox isn't fitting well with the metal hop up (could be fractions of milimeters) and therefore causing an airleak! just try some aftermarket nozzle to find the perfect fit or try to find a ca mp5 loading nozzle... had this happen with my last build, the nozzle was not sealing the hop up chamber tightly! and was causing the gun to fire 110 fps! lol
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member of fire team NOM. my other regular forum: www.toyotanation.com / gen3,gen4 camry
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