This is a DIY part, that means you must assemble it yourself! Also, in order to use it, you must have a Rail Attachment Piece.
This is the Eagle Sight V1.3, a customizable Nerf Sight with two different slots so you can add pieces of plastic with a crosshairs, a HUD or whatever you want!
Make sure you check out Nautilus Customs on YouTube for more Custom 3D Printed Nerf Accessories!