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Any KWA RM4 ERG Owners?

Cr0-Magnon

AF-UK patch owner
Joined
Sep 18, 2019
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I've just picked one of these up second-hand and would like to bump the power up by about 30 - 40 FPS. I've accessed the spring but it's much shorter than standard AEG's (around 125mm). 

Can I use standard length or do I need to order a special KWA one/cut down a standard? If it's the latter, that's going to make working out which spring to use, a serious case of trial and error!

 
I have had one and currently have the Cent Arms version, its the latter I am afraid....

 
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