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Longer barrels deffo increase fps....http://www.airsoft-forums.co.uk/index.php/topic/28443-g-p-force-recon-m4-tb-barrel-upgrade/page-2#entry216840
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didn't occur to me it would go up so much though....
Live n learn I guess
atm spring rating seems to work out maybe for 275/300 barrels in middle. above or below that seems to req next spring up/down
The voodoo airsoft physics I've been told is for V2 363mm is the kind medium length that TM originally designed the cylinder size to facilitate. If you increase length from shorter than 363 up to 363, you'll get up to the same % increase in FPS. E.G 300mm @ 300fps to 360mm @360fps. If you go over this length then the amount of extra FPS you get from going past 363 will get less and less, until eventually you have barrel over-volume issues and a giant step back.
I find spring ratings are only accurate as far as the % difference in FPS goes. Every gun is different so will always give a different figure to start