ENERGY efficient Helical gear set provides Torque Up ratio to power super stiff springs from M130 onwards. Note that high torque means the rate of fire will be lowered but the durability of your gearbox will be increased. Lightened with carbon fiber components (not shown in photo and on other side of sector gear), these gears are 15% lighter than their predecessors). Setting helical gears requires experience in working with gearboxes. Incorrectly setting these gears during installation can result in stripped gears immediately.