A NERF Dart Gun That Breaks the Sound Barrier [Video] Youtuber Giaco Whatever recently built a NERF dart gun that fires darts at 2.3 times the speed of sound, or 800 meters per second! That’s pretty insane! Check it out in the video above! [Giaco Whatever] Sharing is Caring:FacebookTwitterEmailMorePinterestMastodon Geeks are Sexy needs YOUR help. Learn more about how YOU can support us here.