Caliburn Springs (C3 + C4)

These Caliburn Springs are full-length replacement main springs, offering a range of FPS options for your Captain Slug Caliburn 3 and Caliburn 4.  FEATURES:• Caliburn Springs• Squared/flat on both ends for easier use• Tune the FPS of your Caliburn INCLUDES: • 1 Caliburn Spring of your choice PERFORMANCE:Average FPS with a 0.527 x 14in barrel• 110 FPS with a K31 spring (280mm)• 130 FPS with a 788 spring (266mm)• 175 FPS with a K25 spring (280mm)• 190 FPS with a K26 spring (280mm) SPECS• Material: USA-made spring-tempered steel• Type Compression• Dimensions:     Spring Gauge: 1.6-2.0mm     Length: 266mm-280mm     Outer Diameter: 19-25mm     Coils: varies• Squared: Both Ends LINKS:• More Springs