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seanycozzie24v

ics m4 upper gearbox upgrade

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im going to refurb my upper gearbox by regreasing it, new spring etc. im looking to fit a m120 spring. my upper gearbox is already slightly upgraded with the ics pom reinforced piston and a ported piston head. still has the standard cylinder head/cylinder and spring guide afaik. realistically what fps should i get out of it with the upgrades and the M120 spring? thanks in advance

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The last AEG I put an M120 in was shooting about 380fps, far to high for most sites.

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my m4 is shooting at a very low fps at the moment. 268fps i think the springs on its way out. all the seals are fine. maybe 360fps with the new spring?

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