This battery pack brings Nerf guns into the modern era - CNET
Amazon.com: Nerf Pro Gelfire X MrBeast Full Auto Blaster & 20,000 Gelfire Rounds, 300 Round Hopper, Rechargeable Battery, Eyewear, Ages 14 & Up : Toys & Games
Blasterparts - Voltage Set for Nerf N-Strike Titan CS-50 - blasterparts.com