Jen 8 nylon gearbox

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I have a jm m4a1 gen 8 and wanted to know that im putting metal gears into the gearbox and a m110 spring will this work ok without causing any damage cause of the size of the m110 spring i want to use or should i use a smaller spring m100 or m95

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Probably safest to stick with the M95, as without other upgrades it’s easy to get motor stalling or can burn out the trigger switch with heavier springs :flushed:

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M95 should give about 280-290FPS on the chrono… respectable without overstressing. :+1:

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