The K31 Spring is compatible with dozens of blasters. These are identical to the ones from McMaster, except I have had these custom ordered, and they have flat/squared-off ends for a better install experience. This means that even after cutting the spring, you will have one flat end, making installation easier!

FEATURES:
• K31 spring with squared/flat ends

INCLUDES:
• 1 K31 Spring

PERFORMANCE:
Average FPS (Standard Deviation)
• 110 FPS in a Caliburn C4 with a 0.527 x 14in barrel

SPECS
• Material: USA-made spring-tempered steel
• Type: Compression Spring
• Dimensions:
     Spring Gauge: 1.6mm (0.06in)
     Length: 280mm (11in)
     Outer Diameter: 19.8mm (0.78in)
     Coils: 45.75
• Squared: Both Ends

LINKS:
• Other Legacy Springs
• All Springs