I Want The Mk 19 Nerf Grenade Launcher (video)
Definitely file this under “awesome childhood toy given crazy upgrade”: I present to you the Mk 19 Nerf grenade launcher. It runs on batteries that use compressed air to push the nerf ammo fast enough to make the neighborhood bully cry. Check out the video to see what I mean.
Unless you get in touch with the creator and beg him to make you one (or make one yourself), you won’t be seeing one of these in the Toys ‘R Us aisle anytime soon.