seanycozzie24v Posted February 5, 2013 Share Posted February 5, 2013 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 Link to comment Share on other sites More sharing options...
RR01 Posted February 5, 2013 Share Posted February 5, 2013 The last AEG I put an M120 in was shooting about 380fps, far to high for most sites. Link to comment Share on other sites More sharing options...
seanycozzie24v Posted February 5, 2013 Author Share Posted February 5, 2013 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? Link to comment Share on other sites More sharing options...
seanycozzie24v Posted February 5, 2013 Author Share Posted February 5, 2013 also my outdoor site has a fps limit of 365fps Link to comment Share on other sites More sharing options...
seanycozzie24v Posted February 5, 2013 Author Share Posted February 5, 2013 and whats the best grease to use for the piston rails, seals etc Link to comment Share on other sites More sharing options...
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