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AOLS Cylinder Head w/ Top & Bottom (Sunk) Pad for AEG Ver.2 Gearbox Features: Double o-ring for maximum air seal and FPS output. CNC process providing maximum precision and durability. Sunk large bottom rubber pad made out of high quality rubber. Compatible with V2 gearbox of M4, M16, M733, MP5, SCAR etc. Essential part for upgrading your Airsoft AEG Specification: Material: Anodized Aluminum, precision manufactured. Weight: 10g. Suitable for M4/M16 Gearbox and other compatible Ver.2 gearbox Compatibility: Tokyo Marui, G&P, Matrix, KWA, UMAREX, Class Army, Krytac and etc. Brand: AOLS Presented by Airsoft Industry Company