This is a blaster kit that I designed for the Nerf Rival Knockout. This blaster has a few variants. There is a single Spring Thunder shell variant, a single Flypoint shell variant, and a Double Barrel Flypoint shell variant. The links to these shells can be found below: (Or can be bought from GDop26. This blaster was designed to need as few purchased components as possible. I was able to accomplish this by using 8 magnets and 1 or 2 o-rings. The blaster is assembled using the original nerf screws.
Flypoint Shells: https://drive.google.com/drive/folders/162v3c64bsKpt4YixiCbrVr9DC2bSnjDq?usp=sharing
Spring Thunder Shells: https://www.thingiverse.com/thing:3210080
I named this blaster "The Platypus" because it has a tail that kinda looks like a platypus.
If you like this blaster, feel free to post about it on the r/nerf reddit and tag me @ u/RedCowl80 I would love to see it! This is also the best place to reach me if there are any issues with your printing or if you have any questions.
The instructions for building are inside the PDF document.