These Nerf Rival Kronos Springs are custom-sourced and tested to be a perfect upgrade mod for your blaster. Depending on the spring you select, you'll need fairly strong hands to prime this spring. All springs have been custom-built and tested to fit the Rival Kronos blaster with squared ends on at least one side for easier installation.FEATURES:• Compatible with Nerf Rival Kronos• Medium difficulty in installation• Multiple FPS options available INCLUDES:• 1 Rival Kronos Spring PERFORMANCE:Average FPS• 135+ FPS with the OOD 2.1mm Spring• 120+ FPS with a hand-cut length of K25• 120-125 FPS with the OOD 1.8mm Spring SPECS:• Material: USA-made spring-tempered steel• Type: Compression135+ FPS "Strong-Prime"• Dimensions: Spring Gauge: 2.1mm Length: 90mm Outer Diameter: 20mm Coils: 9• Squared: Both Ends120+ FPS "Easy-Prime"Dimensions: Spring Gauge: 2.0mm Length: 105mm Outer Diameter: 24.6mm Coils: 10• Squared: One end120-125 FPSDimensions: Spring Gauge: 1.8mm Length: 120mm Outer Diameter: 20mm Coils: 11• Squared: Both ends• Formerly rated as: 14kg LINKS:• More Kronos Mods• More Springs
