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The AirsoftPro NBU CNC Aluminum Flat Piston Head with Bearing is a durable upgrade piston head designed for New Bore-Up (NBU) air system AEG airsoft guns. It combines a lightweight aluminum body, a ball bearing, and dual O-rings for improved air seal and more precise piston guidance inside the cylinder. It is an excellent choice for building a reliable and high-performance air system.

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ASPRO108
AirsoftPro replacement O-ring for NBU piston head is a set of 2 sealing O-rings designed to restore proper sealing of New Bore-Up (NBU) piston heads in AEG airsoft guns. A worn or damaged seal can cause compression loss and inconsistent performance. These O-rings are a practical spare part for routine maintenance and servicing of the air system.
The AirsoftPro piston head is designed exclusively for New Bore-Up cylinders. Its aluminum construction provides excellent durability while keeping weight low. Six air channels direct compressed air beneath the main O-ring, causing it to expand during firing for an improved air seal. A second O-ring is used for precise centering of the piston head inside the cylinder, helping to ensure smooth piston movement. The piston head also features a ball bearing that allows the spring to rotate during compression, reducing resistance while cocking. A special locking washer between the piston head and piston helps prevent the piston head from loosening during operation.
Designed exclusively for NBU air systems used in higher-performance AEG builds.
The lightweight aluminum body offers excellent resistance to wear and repeated impacts.
Six air channels improve the sealing of the main O-ring, while the second O-ring helps keep the piston head accurately centered inside the cylinder.
Allows the spring to rotate during compression, reducing resistance and contributing to smoother operation.
A special locking washer between the piston head and piston helps prevent the assembly from loosening during use.
| Variants | NBU |
| Color | Red |
| Piston head | Metal |