Replace Marui's Original Gears with this upgrade STEEL Power Gear This Gear Set is the substantial high-cost performance gear set Torque Up Gear is designed to increase torque for pushing higher spring tension in power upgrade AEG Package with 200% Torque Gear Set plus Full-Teeth Piston Suitable for Element, Systema, Laylax & Tokyo Marui Airsoft AEG Piston Series Best Compatible with Element Spring M125ST & M135ST
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