Just HOW BIG Is The World’s Largest Nerf Gun? Barrie, ON, Canada / 93.1 Fresh Radio Lisa O'Hara June 23, 2016 03:08 pm Pretty big as it turns out! An engineer from Nasa found himself in frequent Nerf gun fights, so he designed the world’s largest gun to compete. It shoots pool noodles and toilet plungers!! via GIPHY Read all the details on this crazy gun HERE!