Specifications

Gearbox Shell
Dural Aw 7075 T651 Aluminum Construction
Manufactured With CNC Milling Machines
Lightweight But Extremely Strong (590Mpa)
Quick Spring Change System
QSC Spring Guide And Screws Included
Suitable Only For HPA Rifles M4/M16 Series (Version 2)
Weight 150g (Including Mag Terminal Plate)

Not Compatible With Maxx Cylinder Head

Please refrain from using a MAXX cylinder head with Retro Arms gearboxes, as it may lead to compatibility issues.

Lastly, we must emphasize that installing inner parts and gearboxes requires professional knowledge, experience, and skills. With various gel soft manufacturers in the market, each with their own sizing standards, compatibility issues can arise with parts from different manufacturers. To ensure the best fit, we recommend having the gearbox professionally built and installed by our Tech Team.

Retro Arms has made some useful improvements into their CNC HPA gearboxes V2:

• Spring holders have grooves, so the springs for tapped plate and trigger switch will not jump off.
• Added groove for safety lever, so it will hold during installation.
• Added groove for trigger spring, for better fitting.
• Sockets for bushings/bearings have smaller diameter about -0,02mm (7,98mm), for non-overturning the bushings during installation. The socket edges are cut down for better installation.
• We enhanced grooves for wiring for 1mm, you can now use wirings with 2,5mm diameter.
• Added protecting edge for wiring against the motor.
• All threads are now shaped instead of cut for better strength.
• Both of the gearbox parts are cantered by milled grooves and edges.
• Added hole for releasing anti-reverse latch.
• For better durability, we added more material around cylinder head part of the gearbox, this was the most critical part and we added 100% more material where is huge radius.
• Added groove for anti-reversal latch spring, so it will not jump off.
• Outer edges are now cut off.
• You can find what type of sockets gearbox have on the outside part of the gearbox (8mm or 9mm).

Please note, Images are as a guide only, variations in finish colour occur between different batches and may appear different viewed in daylight, that they do on your device’s screen.