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Hay, haw much would it slow dawn a classic army m15a4 with a 8.4v 1400 mah mini battery buy putting in a PDI 150 or 170? like would it be extremely slow and i would have to upgrade my whole machbox or would it just slow it dawn a touch?
I would really like to reach 400FPS without too much expense and if you have any suggestions on what else i could do please feel free to share them.
thank you,
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