Blasterparts - Modification spring for Nerf N-Strike Elite [XD] Strongarm - blasterparts.com
Worker 6 kg Mod Upgrade Spring For NERF N STRIKE ELITE STRONGARM Blaster/ Nerf Rebelle Spylight Blaster/Zombie Strike Flipfury|Toy Guns| - AliExpress
Amazon.com: Nerf N Strike Elite Strongarm Toy Blaster With Rotating Barrel, Slam Fire, And 6 Official Nerf Elite Darts For Kids, Teens, And Adults(Amazon Exclusive) : Hasbro - Import: Toys & Games