use ics parts only in an ics mechbox. they make upgrade parts. bushings are smaller inner race than marui compatible bushings and ics gears will wobble in marui sized bushings and marui compatible gears are too tight and won't turn in ics bushings. ics tappet is larger than marui tappet and they are cross-compatible. selector plate, semi-auto sway bar and spring guide are also NOT compatible. use ics oily brass bushings, keep your gears, get ics steel ver II spring guide and get piston, piston head and cylinder head from whomever you like. or you could just get a new mechbox but you will have to use the ics selector plate.
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