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You have the hi flow valve and full filled mag could only finish just two full bb mag load is normal since the as consumption is higher, means less bb can be shot. If the slide can't b elocked close to the end of the second mag could be normal too as the gas pressure is not enough to perform full travel blow back.
How about the nozzle, is it original one? The marui nozzle contact to mag is round shape design, not like WE one is flat. If you have a new nozzle that may not have perfect round shape together the best contact sealed, it might drop your fps too. Check it out
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aka Uncle
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