I looked at the reference file and it gave me the following info:
beam weapons have a range of 6.500
lasers (standard weapons) have a range of 8.000
missiles (the long range and last tec weapons upgrade) have a range of 10.500
(by comparison: tec light frig has a range of 3.500, heavy cruiser of 2.750 and lrm of 9.800. all base values)
my guess is that just the range of the standard weapons are displayed. the other weapons work alright and have different ranges, but you just don't see it on screen, because I guess the system simply does not support differing weapon ranges for a single unit.