SHS is famous for developing high quality airsoft products that are highly renowned in the airsoft industry, and their line of internal upgrades follows suit. This high speed AEG motor will slightly increase your rate of fire and torque, while greatly improving internal durability. Combine this motor with the included M120 spring and greatly boost your rifle's rate of fire to shoot the maximum amount of rounds towards your enemies. Constructed completely from CNC machined metal parts, this AEG upgrade is strong and reliable in the most powerful of gearboxes. This kit also included CNC machined gears set in a 13:1 ratio, everything you need to completely reinvent your favorite AEG. Upgrade your rifle to reach peak performance with this High Speed Tune Up Kit from SHS.