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Low Noise High Torque Gear Set with 9teeth Sector Gear Drive Ratio: 16:1 Material:Steel, CNC Machined. Advise using 6.03mm, 6.04mm, 6.05mm innner barrels. Advise using M90-M140 Springs. Suggestion 9mm Bearing, Spring Guide with Bearings, Piston Head with Bearing. Suiltable for Gear Box Version 2 and Gear Box Version 3. Chrome molybdenum alloy steel made sector gear. High strength, difficult deformation. New axis design, improve gear concentricity. Integration of axis & gear instead of cooper shaft guide, more durable. Lower electricity consumption & lower noise. Weight: 80g. Presented by Airsoft Industry Co.