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View larger AirsoftParts DURAL piston head is a CNC-machined piston head made from EN AW 6012 T6 duralumin with 9 ventilation holes for effective expansion of the sealing O-ring. It offers a low weight of 10.8 g, a smooth nickel-plated surface and an axial ball bearing that allows the spring to rotate freely during compression and reduces torsional stress.

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ASPARTS002
AirsoftParts replacement seal set for DURAL 2013 / TECAFORM 2013 piston heads is designed to restore proper sealing of the piston assembly. It includes a sealing O-ring and a centering ring. The manufacturer recommends replacement after approximately 10,000 BBs fired or once a year, as operation gradually deforms the O-ring and reduces its sealing...
4UAD006
4UANTUM SEAL Silicone Grease for Sealing by 4UAD in a transparent finish. High-viscosity sealing grease. Ideal for sealing repairs and preventing leaks from damaged O-rings. Suitable for electric AEGs, manual, GBB, CO2, and HPA gas guns. Content: 15 ml. Easy application with a pen applicator.
SPARMS439
Specna Arms silicone grease in a practical 50g package is an essential service lubricant for airsoft gun maintenance. It is particularly suitable for O-rings, seals, AEG pneumatic systems, GBB valves and HPA systems. It helps reduce friction, protects sealing components from drying out and extends their service life.
AirsoftParts DURAL piston head is a durable CNC-machined component for AEG air seal systems, made from EN AW 6012 T6 duralumin. The front features 9 ventilation holes through which air flows beneath the sealing O-ring during compression. The pressure expands the O-ring towards the cylinder wall, helping to provide an effective seal for the piston assembly. The head weighs only 10.8 g and its surface is finished with high-quality nickel plating for a very smooth surface. The design also incorporates an axial ball bearing that allows the spring to rotate more freely during compression, reducing unwanted twisting and contributing to longer spring life. The plastic nut helps reduce the overall weight of the assembly. According to the manufacturer, the piston head is compatible with all types of gearboxes. In a test with a standard air seal system and an M120 spring, the manufacturer measured an approximate muzzle velocity increase of 5 m/s, although the actual performance change always depends on the air seal, cylinder, nozzle, barrel and other components of the specific build.
Air flowing through the 9 holes in the front expands the sealing O-ring against the cylinder wall, helping to provide an effective seal for the piston assembly during compression.
The piston head is CNC-machined from EN AW 6012 T6 duralumin, which offers a suitable combination of strength, durability and low weight.
The integrated axial ball bearing allows the spring to rotate during compression, reducing torsional stress and contributing to longer spring life.
The high-quality nickel-plated finish creates a very smooth surface on the piston head while also protecting the duralumin component itself.
Despite its metal construction, the head weighs only 10.8 g. The plastic nut also helps reduce the overall weight of the assembly.
During compression, air flows through the holes beneath the sealing O-ring and expands it towards the cylinder wall. This improves the piston seal during the operating cycle.
The bearing allows the spring to rotate more easily during compression. This reduces twisting and, according to the manufacturer, significantly contributes to extending its service life.
This is not a guaranteed performance increase. The +5 m/s figure is only an approximate result of the manufacturer's test compared with a standard air seal system and an M120 spring. The result in a specific gun depends on the complete build and its air seal.
The manufacturer states that it can be used with all types of gearboxes. When building or upgrading, however, it is still advisable to verify the mechanical compatibility of the complete piston and air seal assembly of the specific gun.
| Variants | DURAL |
| Piston head | Metal |