ENERGY efficient Helical gear set provides Super Torque Up ratio to power super stiff springs from M150 onwards. Note that super 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.