To begin, TechT utilized their MRT system creating spiral cut channels of unused bolt material resulting in reduced weight and friction. Made with a combination of aircraft grade aluminum and delrin, this bolt produces amazing air efficiency and shot-to-shot consistency that, during testing, resulted in a 30 fps increase over the stock Phenom bolt. In addition, a Soft Touch face prevents ball breakage and works to seal off the barrel to reduce sound signature. To reap the full benefits of the MRT Bolt, a Phaze-5 Cyclone Feed Air Fitting is also included to improve feed rate and consistency, even when your marker is low on air. The MRT Bolt must be used in conjunction with the Phaze-5 which, constructed of stainless steel, offers much more durability than the plastic factory fitting. As with all TechT products, both of these upgrades include a Full Lifetime Warranty.