Enhance your blaster's performance with the Hyper Rush-40 Pump-Action Nerf Blaster Upgrade Spring. Made of durable piano steel, this 13kg spring will give your blaster a powerful boost.  Upgrade your game with this top-notch spring.

Specifications:

Material: piano steel

Type: 13kg

Package includes: 1x Hyper Rush-40 nerf blaster spring upgrade mod with o-rings