I've uploaded the original texture files (layered to easy edit) to http://daishi.atw.hu, for those who'd like to make some retextures.
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Warhammer 40k Tau Rail Rifle
http://www.fallout3nexus.com/downloads/file.php?id=5523
Ive made it to be more or less an equvivalent for the Gauss Rifle, plus ive made an NPC to get the Tau ammo from (BTW guess what race he belongs to .... yep hes a Tau)
PS i know Tau have hooved feet and four-digit hands (three fingers and one thumb), but the Rifle is the main point
Warhammer 40k Tau Pulse Carbine
http://www.fallout3nexus.com/downloads/file.php?id=6310
Automatic energy weapon with a photon grenade launcher (flashbang)
Warhammer 40k Tau Pulse Rifle
http://www.fallout3nexus.com/downloads/file.php?id=6534
Automatic energy weapon with scope
Warhammer 40k Tau Drone Companions
http://www.fallout3nexus.com/downloads/file.php?id=7632
Some Tau Drones you can reprogram to follow you.
Warhammer 40k Necron Gauss Flayer
http://www.fallout3nexus.com/downloads/file.php?id=7857
For a change of pace heres something from a Tomb World
Warhammer 40k Necron Gauss Flayer and Blaster
http://www.fallout3nexus.com/downloads/file.php?id=9503
Heres the Necron Flayer again with its big brother
Warhammer 40k Tyranid Impaler Cannon
http://www.fallout3nexus.com/downloads/file.php?id=14277
A little underdeveloped but working Weapon-Symbiote from the Great Devourer
Warhammer 40k Tau Compilation
http://www.fallout3nexus.com/downloads/file.php?id=8546
Well this I didnt Actually make this one. Rylasasin from Nexus made the compilation but i htink it should be here