This is a shell chambered in mega darts for the nerf trilogy. It is designed to be printed with supports. It is capable of using a full length mega dart but the increased length that that provides makes it harder to load. it's advised to cut down your megas to make them flush with the shell if you are using a hopper system with this blaster. For optimal performance place the dart into the front of the shell so that the back of the dart is flush with the indented segment on the back of the shell. Firing footage: https://www.youtube.com/watch?v=lzXFFnfqbQ4