This gearbox is a classic bestseller, known for its exceptional durability and low weight.
Perhaps most notably, The QSC (Quick Spring Change) feature makes upgrading and maintaining your replica far easier.
To celebrate our long-time cooperation with Retro ARMS, Brill Armory text has been added to the right side of the Gearbox Shell.
Manufacturer notes:
This is a CNC V2 gearbox designed for Airsoft replicas AR15 (M4), M16 and other ones with a V2 gearbox. This gearbox is manufactured from one solid block of aircraft aluminum (Dural) EN AW 7075 T651, which has higher strength (590MPa), than common construction steel (390MPa).
Because of the material used, our gearboxes have the best durability and resilience than common zinc-aluminum gearboxes. We are manufacturing these gearboxes on our precise CNC milling machines in our factory. The detail in parenthesis (8mm) means the diameter for bushings and bearings.
The Package includes: CNC Gearbox V2 (8mm) – QSC in chosen color, a set of screws and a QSC spring guide.
We made some useful improvements into our CNC V2 gearboxes:
- Spring holders have grooves, so the springs for tappet 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.
- AoE (Angle of Engagement) control hole.
- Sockets for bushings/bearings have smaller diameter about -0,02mm (7,98mm), so that bushings and bearings do not rotate when installed. The socket edges are cut down for better installation.
- We enhanced grooves for wiring for 1mm, so you can now use wiring with 2.5mm diameter.
- Added a protecting edge for wiring against the motor.
- All threads are now shaped instead of cut for better strength.
- Both of the gearbox halves are centered by milled grooves and edges.
- Added hole for releasing the anti-reversal 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 there is a huge radius.
- Added a groove for the anti-reversal latch spring, so it will not jump out of place.
- Outer edges are now cut off.
RetroArms gearbox has a quick spring change system (QSC), where you can remove the whole spring guide with a hex key and change the spring without need of opening the entire gearbox.
With this solution, you need to secure spring guide with a screw, commonly with AR 15 (M4) replicas, it is by the stock or buffer tube screw. In situations where you have folding stocks or no stock at all, you have to secure the spring guide with QSC screw. Otherwise, the spring guide may get stuck with the spring. This is because the spring guide is not fixed in the gearbox, but has free space for easier removal with a hex key.
Space for trigger switch is designed for compatibility with trigger switches, trigger units from common manufacturers for example: Gate, JeffTron, etc.
CNC gearbox V2 has protective anodizing, even when it is problematic to anodize aluminum EN AW 7075 T651 (Dural), because of its high strength and hardness. If we did not anodize products from this material, there is huge risk of corrosion (huge gray spots with rotten look).
This CNC gearbox can be installed only in airsoft replicas with Tokyo Marui compatible dimensions. That means even the parts installed inside the Gearbox. Do not use brute force during installation. Use only 1Nm tightening moment on screws, otherwise the screws will overturn in heads. There is no need for tightening screws with brute force; if you want to be sure that screws will sit perfectly, use threadlocker.
You can use in this CNC gearbox any spring of your choice, but be aware that stronger springs will result in lower durability.
!! Do not use MAXX cylinder head !!
Installation of the inner parts and gearbox requires professional knowledge, experience and skills.
There are a lot of airsoft manufacturers on the market and every one of them create their own sizes, there are no standards like engineering ISO in airsoft. This is the main problem with a lot of inner and outer parts from different manufacturers which can be the same product, but with different dimensions.
We recommend using only parts from manufacturers with Tokyo Marui compatible parts, where there should not be a problem with compatibility with our CNC gearbox.
