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Old 03-14-2019, 05:58 PM   #110 (permalink)
freedummy
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Join Date: Aug 2012
Location: Calgary, Alberta

Re your facebook question -

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So it's a (surprise surprise!) Blow forward bolt. Now, will cutting the spring lower the fps or should we use rubber shim to make it harder? Harder spring=lower dwell=less gas=lower fps?
Cutting the spring would indeed increase FPS. You either need a longer/stronger spring, or (the better solution) devolumize the valve with an insert.
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