RetroArms CNC piston for Tokyo Marui AA-12 / SGR-12 is a specially designed upgrade part for the Tokyo Marui AA-12 and SGR-12 AEG shotguns. It combines a carbon-reinforced nylon body with a rack made of high-quality hardened steel. Two mounting screws are included – one for securing the rack and one for attaching the piston head extension. The original self-tapping screw must not be used.

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This expert product description was prepared by the ANAREUS.cz expert team. All rights to this unique content are bound to the anareus.cz domain.RetroArms piston for Tokyo Marui AA-12 / SGR-12 is specifically designed for the unique mechanism of the Tokyo Marui AA-12 / SGR-12 electric airsoft shotgun. The piston body is made of carbon-reinforced nylon, while the heavily stressed toothed rack is made of high-quality hardened steel. This combination of materials has been selected with regard to the mechanical stresses placed on the piston during operation inside the specific AA-12 gearbox. The package includes two screws with different functions: one secures the steel rack against movement, while the other is used to attach the AA-12 piston head extension. During installation, it is important to use the supplied screw and not to use the original Tokyo Marui self-tapping screw. The piston is intended as a specialised replacement or upgrade part for the AA-12 and cannot be considered a universal AEG piston for standard gearboxes.
The piston is designed specifically for the Tokyo Marui AA-12 / SGR-12 AEG airsoft shotgun and its unique internal mechanism.
The body is made of carbon-reinforced nylon, providing a lightweight and durable foundation for the entire piston.
The toothed rack is made of high-quality hardened steel for use in the mechanically stressed section of the piston.
One of the supplied screws is used to secure the steel rack against unwanted movement inside the piston body.
The second screw is intended for attaching the AA-12 / SGR-12 piston head extension. The original self-tapping screw must not be used during installation.
Yes. The piston is specifically designed for the Tokyo Marui AA-12 and SGR-12 AEG shotguns. It is not a standard AEG piston designed for conventional gearboxes.
The body is made of carbon-reinforced nylon and the toothed rack is made of hardened steel.
One screw secures the steel rack against movement, while the other is used to attach the piston head extension.
No. The manufacturer explicitly states that the original self-tapping screw must not be used. Use the screw supplied with the RetroArms piston to attach the piston head extension.
| Color | Black |
| Body/receiver material | Metal |
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