Replace Marui's Original Gears with this upgrade STEEL Power Gear This Gear Set is the substantial high-cost performance gear set Original Type do not increase the muzzle velocity or rate of fire but it increase the durability of your gaerbox Package with Gear Set Suitable for Element, Systema, Laylax & Tokyo Marui Airsoft AEG Piston Series Best Compatible with Element Spring M90,M100,M110,M120,M125ST
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