OK i am sharing another videos i found on youtube about Defiance weapon Skill leveling. Like most people i didn't pay attention to weapon skills explanation in game and i also use the same awesome ass modded weapon I built over and over again and noticed my weapon XP maxed out an i got a nice bonus for it but my Overall Weapons Skills was not increasing. :| So after doing some searching.... Gotta Love Google.. I came across this youtube that explains why http://youtu.be/Lux90AoEMOQ