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Some pistons (don't ask me which ones right now, all I know is that they exist) will fail the piston compression test that Bean outlines even though they have normal compression. With a 150 or 170 spring I too would chop the airbrake (white shaft sticking out of the piston) as this could account for your entire FPS discrepancy and it's not going to make your gun any quieter at the FPS it should be shooting at.
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