Spring swap

snuff

Brigadier

Join Date: May 2010

Posts: 2334
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#1

Spring swap

13 February, 2013, 18:22

A friend has bought 3 King Arms Colt M4 A1 Ultras and they are all firing at 400fps on 0.2's,anybody know what the standard spring is or know which one to replace them with to bring the fps to site friendly 350fps?
Cheers...

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Lt3033

Lieutenant

Join Date: Mar 2012

Posts: 480
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#2

13 February, 2013, 18:53

Re: Spring swap

Normally an m90-m100 depending on how good the air seal is

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