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: AverageFPS with a 0.527 x 14in barrel • 110 FPS with a K31 spring • 130 FPS with a 788 spring • 175 FPS with a K25 spring • 190 FPS with a K26 spring
SPECS • Material: USA-made spring-tempered steel • Type Compression • Dimensions: Spring Gauge: 1.6-2.0mm Length: 280mm Outer Diameter: 19-25mm Coils: varies • Squared: Both Ends
