The BT Spring Kit is available for use in BT-4 and Model 98 markers and allows you to increase adjustment over the stock velocity. This paintball spring kit includes five different main/velocity springs, two stiffer than the stock model, one in stock strength and two softer springs. Installation is easy and performance is guaranteed with the Spring Kit from BT Paintball.
Features
* Red Spring – Hard
* Silver Spring – Medium
* Black Spring – Stock
* Green Spring – Light
* Blue Spring – Ultra Light