long barrels dont make much difference at all when it come to range, neither does fps. its mostly comes down to how tight the barrel is and the hop rubber your using and setting it just right. lighter bb's will go further but loose accuracy. when u clean ur barrel try using a bit of oil on the strip you clean it with, it stops air esscaping around the bbs, but not too much or u may clog the barrel. yeah my tm famas was 285 fps and it could outrange most aegs out there up to about 80 metres at best on a good day.