Nerfenstein - more boringly known as Aesthetic Nerf Mods Australia - takes regular old Nerf guns and, with a little customisation and paint work, turns them into replica weapons based on those found in video games, movies and comic books. Replica weapons you can shoot a kid in the face with and not feel that bad about.
Some of the games featured include Portal, Fallout and Mass Effect, while there are also weapons from Akira, Blade Runner and Stargate.
Before you complain, note she's limited by the stock mechanics of Nerf guns! So while some weapons look just like their fictional counterparts, others have to take a step back and be simply inspired by them.
GirlyGamerAU [DeviantArt, thanks April!]