User blog comment:Jkphantom9/GUYS, STAY CALM.../@comment-108.38.193.5-20140603055744/@comment-24076441-20140603084423

it's kinda like an inside joke. people kept asking if there would be a gun that wasnt a sword, so the writers started calling the upcoming weapon that wasnt a gun/anotherweapon the 'gun-gun'. it refers to how it's a gun & is only a gun (unless they're messing with us. god forbid a gun that shoots guns).