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PRODUCT DESCRIPTION: This is a replacement K31 Spring specifically for the Caliburn but can also be used in blasters of your choice. This K31 spring has two cut ends for the Caliburn so it's slightly different than our standard K31 Spring. This spring will limit the FPS of the Caliburn to under 110FPS for certain game rules and indoor play.
FEATURES: • Designed by Captain Slug • Licensed and Authorized by the legendary Slug himself