Oh kay. They had mods on the fallout 3 nexus that changed the looks of the unique weapons. Is is legal to port them over and post them, using those different meshes, and the same names as in fallout 3? (With permission ofcourse from the maker of those meshes)

So long as the base texture those unique ones are based on are in both Fallout 3 and New Vegas, then yes it is fine. If the textures were 100% made from scratch, then it is also fine.

Thank you.