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For: Modify Polycarbonate Piston Head w/ BearingsProduct Information:
it is a nice piston head but the o-ring it comes with is to tight and gets zero compression. You have to replace the o-ring with the one off your old piston head. Thanks to the bearings my shots are more consistent. If you dont mind replacing the o-ring then its a good buy.
$6 cheaper than systema piston head
the o ring it comes with is too tight