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First the fps listed on the box can be way off so...
shoot about 300 bbs through the gun to settle in the components
then get it chrono'd in the flesh
and then watch lots of disassembly videos on you tube
and then look at illusions spring chart (under news/info above)
and then change spring or get someone else to do it
and then re chrono it
and then your either happy or starting over
and then wait for your first part failure
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