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Old February 18th, 2013, 20:25   #6
ThunderCactus
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Join Date: Feb 2007
The marui japanese line is specifically designed to run at 300fps. No more. So they are not built to handle the stress of a 380fps spring.
There are ways to get around it, notably the ARS sorbo cylinder head which allows you to run a marui V2 at 400fps. But other things may break like gears & bushings

FPS mean very little when it comes to range, so just use .25g BBs and install a guarder clear hop rubber.
Friend of mine has a stock marui P90, all I did was put a guarder clear rubber in it and it shot 160ft easily and fairly accurately
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