The Eagle Force Hummer 1300 Max Torque Motor is similar to the Systema Magnum high torque motors with strong magnets and good torque. This high torque motor is designed for upgraded version 3 (short type) guns with higher springs than an M140, such as a M150 or M160 spring. All in all this motor is a good product.
Manufacturer: Eagle Force / Hummer
Design: M140 spring or greater
Compatibility: AK Series, G36 Series, AUG, and Thompson