Amazon.com: NERF Rival Vision XXII-800 Blaster, Most Accurate Rival System, Adjustable Sight, Integrated Magazine, 8 Rival Accu-Rounds : Toys & Games
Nerf Hyper Series Review (+ Best Guns) | Blaster Central
Nerf reveals Hyper, its next-gen high-capacity blasters with the fastest reloads ever - The Verge
left the one on the left in the melting snow, and apparently rival balls are similar to sponges. they are off brand so maybe that has something to do with it. :
Nerf Hyper Series | A Brief Introduction - YouTube
Amazon.com: NERF Hyper 200-Round Refill Includes 200 Hyper Rounds, for Use Hyper Blasters, Stock Up Hyper Games : Toys & Games