FYI, it's a bearing piston head, not cylinder. Personally I prefer to have a bearing piston head just to be "safe", it puts less stress on the spring to have bearings.
I think you might get a small increase on fps as well, might not be too noticeable though.
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G&P M4 Sopmod
G&P Mk18 Mod 0
KSC USP Tactical (System 7)
T.A.C.O.
Tactical Airsoft Combat Operatives
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