CNC Piston with Steel Rack – 19 Teeth

RetroArms CNC piston with 19-tooth steel rack for high-performance AEG builds
The piston body is made from POM, a material suitable for sliding and mechanically stressed components that helps maintain low friction as the piston moves inside the gearbox. The high-stress section consists of a steel rack precisely machined using CNC technology. The combination of a lightweight polymer body and durable steel teeth makes the piston particularly suitable for higher-performance upgrade builds. Before installation, it is essential to verify that the specific gearbox and gears use a design compatible with a 19-tooth piston, as found in the SR-25, PSG-1 or L85; the tooth count itself is not universal across all AEG platforms.
Key features

19-tooth steel rack
The high-stress gearing consists of a 19-tooth steel rack designed for compatible SR-25, L85 and PSG-1 AEG gearbox configurations.

Precision CNC machining
The steel rack is manufactured using CNC machining, allowing precise machining of its geometry and individual teeth.

POM piston body
The POM body provides low friction and suitable mechanical properties for the repeated movement of the piston inside the gearbox.

For mechanically demanding builds
The combination of a polymer body and durable steel teeth is suitable for high-performance AEG builds where the piston is subjected to higher mechanical loads.

Combination of low friction and durability
The design takes advantage of POM in the piston body and steel in the high-stress rack, allowing each material to perform its specific role within the assembly.

Technical specifications

Type: CNC piston with steel rack
Body material: POM
Rack material: Steel
Rack manufacturing: CNC machining
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