This is for APS-2 & TYPE96.The total length is 240mm arround.
This is 13mm diameter & 11mm inner diameter,so please use the 9mm SP guide & piston has 13mm inner diameter.

Material
We choice the silicon chrome steel to make out this spring cause that is superior to breaking strength.And onemore,we can adjust the finely pitch.,so we make an adjustment of the power level.

Variable pitch
Our springs are all "perfect"variable pitch.So compressing is light & fast return.
I know some "variable pitch",but that's just connect the some different pitchs.Those are not comfortable cocking & not power we want.

What's the 120 ?
It means 120% stronger than normal spring power(0.7J).
So it would be 0.9J arround(use 0.2gBB) when with PDI precision cylinder Set HD.
In that case,output level is here.
313 ft/sec , 95 m/ sec ,0.75J

Our Spring may not be correct response.Because our springs are made by craftsman.
Our springs couldn't be made by machines because we need to make with variable pitch(some machines couldn't make that completely) ,so it may happen 10% up & down.
And please check your upgrade parts.If you use HI-SP cylinder kit,it may be down a few output.