Silent Cylinder Head NBU

AirsoftParts NBU Silent Cylinder Head for Bore Up Air Seal Systems
The NBU version is designed for Bore Up air seal systems with enlarged dimensions and must be combined with an NBU cylinder and NBU nozzle. The design combines a sealing collar and a large rubber impact pad into a single component that seals the head inside the cylinder while helping to cushion mechanical shocks when the piston head impacts. Together with an additional sealing ring, it creates a double seal. The impact pad has a hardness of 70 ShA. The duralumin body features an electroless nickel-plated finish that creates a uniform and very smooth surface with high wear and corrosion resistance. According to the manufacturer, the surface hardness after plating reaches 660–850 HV (58–63 HRC). The low friction of the nickel-plated surface also promotes smooth movement of the compatible NBU nozzle. The head weighs 11.5 g, is designed for V2 and V3 gearboxes with the corresponding NBU air seal system, and the manufacturer specifies a maximum recommended spring of M170. Made in the Czech Republic.
Key Features

NBU Design for Bore Up Air Seal Systems
The enlarged design corresponds to an NBU / Bore Up air seal system. For proper operation, the cylinder head must be combined with the corresponding NBU cylinder and NBU nozzle.

Sealing Collar and Impact Pad in One Piece
The integrated design combines a sealing collar with a rubber impact pad. A single component therefore seals the head inside the cylinder while also helping to cushion impacts from the piston assembly.

Double Seal
The combination of a sealing collar and an additional sealing ring helps limit air leakage between the cylinder head and NBU cylinder and supports proper sealing of the air seal system.

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