Quote:
Originally Posted by Dynamo
when i plug the end of the barrel that piston stops before passing the midway point of the cylinder.
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another little trick on some ported piston heads is to open the holes up a little,
namely I worked on a mp5 that had a stock ported piston head but the ports were TINY.
I used a hobby stlye 1mm finger drill and made the ports larger,
now with the added prressure on the oring to the cylinder wall it would hit compression faster thus more air volume to push the bb..
I am sure you have replaced it (with 12 pages you must have replaced it) but check the Oring, if its to strong it takes alot before it will compress against the cylinder wall.
Im a little late to this thread so forgive me if you have tried these methods already
good luck
SV