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Old December 9th, 2012, 21:38   #6
Scrivah's Avatar
Join Date: Oct 2012
Location: London, ON
You will always be safe using a m90 spring. I have a madbull 100 in my KA M4 and it shoots 345-355 when I have perfect compression. My buddy's KA m4 shoots 359-363 or so with a 100. I think you would be safe with a 95 (depending on the gun), but if its for indoor a 90 is always a safe bet and 20 or 30fps difference is no big deal indoors.
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