Boys can build their own blaster for each mission or battle with the nerf modulus ionfire blaster from hasbro customise the blaster with the barrel extension and dart storager slide the dart holders onto the blasters tactical rails to keep darts within reach for quick reloading heading into battle customize with the barrel extension on a covert mission remove the extension to create a stealth sized blasterr the nerf modulus ionfire blaster fires one dart at a time and comes with 4 darts