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KM 4 downgrade


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#1 rccapps

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Posted 25 May 2013 - 01:46 AM

Guys I need to lower my fps on my KM4 from 390 to 350 fps with .20 bb. What is the best way to do this either a new cylinder or new spring? If spring could you suggest what spring to use? If cylinder please do the same. Thanks for your help.

#2 Icurblud

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Posted 25 May 2013 - 12:28 PM

Easiest way is put an m110 spring in.  I put an m120 spring in my cqr mod 2 and just cut a 1/2" off the spring and now it's shooting 345-355.

Edited by Icurblud, 26 May 2013 - 05:18 AM.


#3 vanevery

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Posted 25 May 2013 - 05:54 PM

I agree with Icurblud.
Changing the Main Spring makes more sense so that you do not lose the Cylinder volume.




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