The Systema Energy Bushings are manufactured by cutting / grinding 303 stainless steel. The main function of stainless steel bushings are to extend the durability of the Spur Gear Bearings by preventing premature damage caused by the use of a high tension spring.
Systema Ball Bearing bushing set for Version 2, Version 3 and compatible gearboxes. Recommended for use with high speed/low torque applications. Not compatible with Marui M1A1 or P90 style airsoft guns.