Original Upgrade Kits for WE KATANA Gear Box.Suitable for WE KATANA M4 AEG Series ONLY.Upgrade Kits included:Piston set (15 tooth) X1Spring Guide for KATANA Adaptive Cylinder X1Steel Sector Gear (15 tooth) X1CNC made Stainless Bushing Set (8mm) X6Steel Selector Plate X1
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