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downgrade spring to 400 fps... shoot it till it breaks and go from there.
and wow... if you don't know what an o-ring is for in an aeg... don't open one up. XD
chrono the gun first before opening it. With the slight change this year in importation regulations, guns from certain factories can come in without having big springs put in.
a 130 spring in that length of barrel is definitely going to be over field limits.... I would go with a 100 spring and see how it works out... at a minimum of 360 fps, if you have a full cylinder and super long barrel as an rpk should, you'll probably get a bit more than 360. If a 100 is too low, a 110 will put you really close, possibly over 400. Go with the sure bet of the 100 spring.
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