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Its a stock piston/piston head (TM) with a sorbo pad on the front.
Why would it suck and not push? Unless im missing something it should be compressing air on the way forward for power then should easily come back to do it all over again.. My gun was working fine for a few rounds last night (after installing a tight bore/new hopup rubber and new bushings/sorbo) then today it worked for a few shots then on fully it would quiet fireing i could hear the piston hitting the the bb was not fireing out so i figured it wasnt getting enough pressure and this is now where im at
its a TM MP5
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