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The fire chambers are there to adjust your FPS without touching your PSI and having to reset your dwell to get it perfect.
no insert - highest fps
green insert - high fps
blue insert - moderate fps
silver insert - about indoor fps
this rule also changes after you add upgrades and such to it. A lighter bolt and QEV will likely force you to use a smaller firing chamber so you can get your desired fps
So it's really up to you and your gun (since every one is different).
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