Hi Torque helical gears (designed to pull springs up to M140S)
For II and III generation gearboxes
For M4-M16-AK-MP5-G36-G3-AUG-SIG-SCAR-MASADA-MINIMI-M60-MP40-MP44 series
They have a ratio of 23.8:1
Helical teeth cause less noise than normal teeth
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