BrittLiv, a chemical and biological engineering student loving making stuff created the enhanced, steampunk-style Nerf gun. As we can see from the images, the Nerf gun features brass and silver coatings with weathering detail, most importantly, the modified Nerf Maverick comes with a rotating barrel mechanism and three magazines in order to load 18 darts at one time, so if you also want to make the Nerf gun with three magazines, you have to prepare three Nerf Maverick. The other accessories and making steps have been listed on instructables.