PRODUCT DESCRIPTION:The OOD Siege 50 upgrade Spring increases the FPS and range of the blaster. This spring is an OOD exclusive and is made of zinc-coated spring steel.
FEATURES:• Compatible with Nerf Hyper Siege 50• Zinc Coated Steel Construction• Average FPS 141 Standard Deviation 1.9
SPECS:• Material: Zinc Coated Steel• Dimensions: mm• Weight:
ADDITIONAL LINKS:• Rush 50 Hop Up
Was easy to install, and what a difference!!
I had to take the blaster apart 4 times to get it back together properly. Spring works fine, but it needs reference materials to ensure install.