gear set with ultra torque up gear ratio of 26:1 for 110-170 m/s springs. A low gear-ratio gives a lower rate of fire and helps to reduce stress on the motor, and produces less impact-energy on first-contact with the piston, prolonging life of both. Engineered for highest performance. Smoother and quieter operation. Reduced stress on the motor. Less impact energy on piston. Materials of the highest quality.