ENERGY efficient Helical gear set provides regular torque ratio to power normal or powered up springs up to M120. Lightened with carbon fiber components (not shown in photo and on other side of sector gear), these gears are 15% lighter than their predecessors). Note that regular torque ratios means the rate of fire will not be affected. Setting helical gears requires experience in working with gearboxes. Incorrectly setting these gears during installation can result in stripped gears immediately.