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Was talking to Illusion today, is why I bought it up, because according to him even a 10cm barrel length difference can make a huge difference on fps. I put a 110 spring in my MP5, had the bearing spring guide in there, calc'd rough fps out to be about 375fps, was getting at the top end 345fps (my Glock 19 shoots at 340fps, AEG should be higher). Hence my saying, he's seen 110 springs put out everywhere from 330fps to 400fps, depending on other upgrades and barrel length. Seeing as how this topic is about a 120 spring................
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