CNC gearbox V3 AK (8mm), QSC

CNC gearbox V3 designed for airsoft replicas AK and various modifications of AK weapons. 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 used material, our gearboxes have the best durability and resilience than common zinc-aluminum gearboxes. The gearbox is manufactured on precision CNC milling machines, directly in the RetroArms factory. Detail in bracket (8mm) means diameter for bushings/bearings.

Package includes: CNC Gearbox V3 AK (8mm) – QSC, set of screws and QSC spring guide.

RetroArms CNC gearboxes V3 improvements:

• Spring holders have grooves, so the springs for tapped plate and trigger switch will not jump off.
• Sockets for bushings/bearings have smaller diameter about -0,02mm (7,98mm), for non-overturning the bushings during installation. The socket edges are cutted down for better installation.
• Next to the motor gear is a window to simplify the setting of the motor pressure.
• All threads are now shaped instead of cutted for better strength.
• Both of the gearbox parts are centered by milled grooves and edges.
• Added groove for anti-reversal latch spring, so it will not jump off.
• Outer edges are now cutted off.

RetroArms gearbox has quick spring change system QSC, where you can put out whole spring guide with hex key and change the spring without need of opening the gearbox. In this solution, you need to secure spring guide with screw. Commonly with AR 15 (M4) replicas, it is by stock screw. In situations where you have folding stocks or no stock at all, you have to secure the spring guide with QSC screw. Otherwise there could be situation, where the spring guide will stuck with the spring. This is because the spring guide is not fixed in the gearbox but has will for easy removing with hex key. The second variant is a fixed spring guide, which does not allow quick replacement of the spring, but it is not necessary to secure the spring guide with a QSC screw.

Space for trigger switch is designed for compatibility with trigger switches, trigger units from common manufacturers for example: Gate, etc.

CNC gearbox V3 has protective anodizing, even when it is problematic to anodize aluminum EN AW 7075 T651 (Dural), because of its high strength and hardness. If this material were not anodized, there would be huge risk of corrosion (huge gray spots with rotten look).

CNC gearbox can be installed only in airsoft replicas with Tokyo Marui compatible standard. That means even the inner parts. Do not use rude force during installation. Use only 1Nm tightening moment on screws, otherwise the screws will overturn in heads. There is no need of tightening screws with rude force, if you want to be sure that screws will sit perfectly, use thread glue or thread color.

You can use in 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 same product, but with different dimensions. We recommend using only parts from manufacturers with Tokyo Marui compatible parts, where should not be a problem with compatibility with CNC gearbox.