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Ok!
There's no .20 ECO Bastards, so you would have chrono'd with .25.
387 with .25 is 433 FPS. The chronos at Claybank were also very messed up because when people hit the sides, the people operating them did not clean the BB shavings off of the sensor gates. There were some stock TM guns that where chronoing over 500 one shot, then 290 the next lol
Try a 2.5mm allen key.. If I'm correct, that's the one that should adjust it.
The gear noise could very easily be your re-shimming. I checked and corrected the shimming when I got it from the guy you got it from. It was fine when it left.
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