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Well my M14 was upgraded fully with Prometheus and guarder spring guide ! Spring was a MS110. We did get a very stable 395 FPS on stock gear with 8.4V 3600 battery.
I had a game very my M14 was shoting over 420 with the same upgrade !, the hop up was broken, so with the Hop up at zero you will reach 20-25 fps more !
Check your hop up, maybe it's on Zero or broke !
JF
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