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basic question here but I'm a bit overwhelmed by all the spring info :-/
I'd like to upgrade my spring, nothing crazy just an extra 10-20% over my existing spring, problem is I don't know where my spring fits in the chart.
(I'm also assuming I can do this with out an overhaul of the gear box)
the gun is a stock ICS M4. I believe its shooting roughly 330 fps out of the box (roughly King Arms M90 ?)
I looks like a Systema M100 might do the trick.
Not expecting anything "definitive" but a rough idea would be helpful.
thanks
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