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RetroArms CNC Piston with Steel Rack – 19 Teeth
RetroArms CNC Piston with Steel Rack – 19 Teeth (SR-25 / PSG-1) is a durable upgrade for high-performance AEG builds where the piston and its teeth are exposed to high mechanical loads. It combines a low-friction POM body with a precisely CNC-machined steel rack with 19 teeth. The result is a design focused on reliability and long service life under demanding use.
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Accessories
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RetroArms CNC SR-25 POM tappet plate is designed for V2.5 gearboxes used in airsoft replicas such as AR10 / SR-25, PSG-1 and other compatible platforms. It is made by CNC milling from Ertacetal-C (POM), which combines durability and flexibility. The precisely machined front section helps ensure correct nozzle guidance and makes nozzle adjustment easier.
19,03 €Out of stock
20,72 € In StockRetroArms CNC Stainless Cylinder – Type E (470–650 mm)7167
RetroArms CNC stainless steel cylinder – Type E is an upgrade part for AEG airsoft guns with an inner barrel length of 470–650 mm. 1.4541 stainless steel, CNC turning and thermochemical treatment with a surface hardness of 630 HBA provide a durable working surface, while the blackened finish helps protect the cylinder against corrosion.
20,72 €In Stock
71,47 € In StockRetroArms CNC Steel Gears Set PandoRA SR-25 20:1 (3mm)8007
RetroArms PandoRA SR-25 20:1 with 3mm axles is a set of CNC steel gears for upgrade builds using an extended 19-tooth piston. All gears are machined from a single piece of steel and were tested by the manufacturer with an M210 spring. The standard 3mm axles are designed for conventional airsoft bushings or bearings and shims.
71,47 €Out of stock- SA PTFE Teflon Grease (50 g)
SPARMS440
Specna Arms PTFE grease in a practical 50 g package is a service lubricant for mechanically stressed parts of airsoft guns. It is particularly suitable for gearbox gears, piston racks and sliding surfaces. The PTFE additive reduces friction and wear while helping to ensure smooth operation of the mechanism.
6,77 €On the way - SA Ceramic Grease for Moving Parts (50 g)
SPARMS441
Specna Arms ceramic grease in a practical 50 g package is a service lubricant for highly stressed moving and mechanical parts of airsoft guns. It is particularly suitable for gearbox gears, the piston rack and heavily loaded sliding surfaces. Ceramic additives help reduce friction and protect components against wear.
8,04 €In Stock - SA OBLIVION SR-25 18:1 Precision Steel Gear Set with Improved...
SPARMS447
Specna Arms OBLIVION SR-25 18:1 gears made of durable 40Cr steel are an upgrade gear set for AEG V2.5 and PSG-1 / L85 gearboxes. The gears feature modified sector gear timing to reduce PME in high-speed builds, high hardness of individual components and a versatile 18:1 gear ratio suitable for both standard and high-stress builds.
31,72 €In Stock
RetroArms CNC piston with 19-tooth steel rack for high-performance AEG builds
The RetroArms CNC piston is designed for AEG builds using a piston with 19 teeth, where gear-tooth durability under higher mechanical loads is important. 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
- Number of teeth: 19 (SR-25, L85 and PSG-1)
- Weapon type: AEG
Package contents
- 1× RetroArms CNC piston with steel rack – 19 teeth
Frequently asked questions (FAQ)
Which AEG builds is this piston suitable for?
The piston is designed for SR-25, L85 and PSG-1 platforms using a 19-tooth piston design. It is particularly suitable for higher-performance configurations where durable steel teeth are required. Compatibility with the specific gearbox and gear set must be verified before purchase.
Why does the piston have a POM body and a steel rack?
POM provides suitable sliding properties and low friction for piston movement, while the steel rack provides durability at the point where the piston teeth engage the sector gear.
Is a 19-tooth piston universal for all AEG gearboxes?
No. The number of teeth must correspond to the design of the specific gearbox (SR-25, L85 and PSG-1) and the gear set being used. This piston therefore cannot automatically be used as a replacement for a standard piston with a different number of teeth.
Is the piston suitable for higher-performance upgrade builds?
Yes. The combination of a POM body and CNC-machined steel rack is particularly suitable for AEG builds subjected to higher mechanical loads. Overall reliability, however, always depends on correct assembly and proper matching of the other gearbox components.
| Variants | SR-25 / PSG |
| Color | Black |
| Body/receiver material | Metal / ABS |
| Amount of piston teeth | 19 |