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Hi! I am planning on getting the Krytac MKII SPR and it says it has an FPS of 400. There are review channels out there ranging from 370-420 for their fps for the same gun using .20g bbs. So just to be safe, how would I lower the fps of the gun? Would it be to simply change out to a shorter spring or what? My field has a max of 400fps. Thanks!

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Depending where you're getting it from, ask the retailer to chrono it before you receive it. Springs will 'settle' from new often giving a slightly lower fps after a couple of weeks. Krytacs are generally very good at coming in under 400fps, but a reputable retailer should address any issues before the gun is sent out to you.

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And how was it chrono'd. Many Airsoft chorono's are very unreliable and has never been calibrated.

 

You can try the accelerated spring compression method. Fire the AEG in FA mode. Then leave it in that state for 2 weeks. Then recheck the speed. You can also shorten the barrel. This will drop FPS and you will not lose much if any accuracy too.

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