This shell allows you to fire Mega Darts from your Sledgefire by frontloading them. The advantage of this design is that you don't need to modify your (now expensive) blaster in any way for this to work. The disadvantage is that you can't preload darts into the shell. You have to put the shell in, then stick a dart on the front.

I have tested this design and the dart does not go nearly as far as the darts in the standard 3-shot shell. The dart fits snugly on the front cylinder and the shell fits perfectly in the blaster. I suspect the issue may be that air is escaping through the cracks between the layers. If someone else can solve this problem, I would be very grateful.