[RETRO ARMS] CNC gearbox V2 (8mm) for VFC - QSC

Made entirely from EN AW7075-T651 ultra-super duralumin
High precision, high strength gearbox for VFC AR series.

VFC original bolt catch part mounting part and left and right connecting arm clearance,
There is a recess for the ambiselector connecting gear,
Furthermore, the front-to-back length of the part that holds the selector plate is different from the regular Gearbox V2.

Dramatically improved strength and precision compared to the original zinc gearbox
The unit weighs approximately 150g, which also contributes to weight reduction.
In addition, each part is reinforced with thick walls for structural strength.

The spring has a quick change structure using a special spring guide.
It can be easily adjusted by simply replacing it from the rear.

It is the 2025 version, but it has a part where you can attach the original bolt stop gimmick part.
To avoid interference, the company's CNC Lateral adjustment of gearbox alignment
Cannot be used.
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The cylinder holding system has been expanded to six points, three at the front and three at the back, making it compatible with cylinders from a wider range of manufacturers.
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The wiring space, which was a problem with Ver.2, has been enlarged, and a thick cord with a maximum finished outer diameter of Φ3.5 mm can be used.
Since it is designed to allow for easy passage, it is ideal for high-load use such as high-cycle tuning.

Furthermore, the wiring is hidden under a unique wiring guard under the pinion.
The pinion gear no longer damages the wiring. It is designed to allow the signal wire of the electronic trigger to pass through.
It is also extremely easy to incorporate electronic triggers. It is compatible with V2 electronic triggers from various manufacturers, including Jefftron, GATE, and Shiranui Shoten.
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Common precautions for all gearbox versions
Be sure to use a cylinder head that fits tightly against the gearbox, as shown in the image above.
For example, the G&G genuine cylinder head cannot be used because it creates gaps.

If there is even a small gap, the piston impact will be received by the rotation stopper protrusions on the left and right, causing damage.
Ideally, it should fit snugly against the gearbox, with enough clearance to move slightly backwards.
For the same reason, cylinder heads with O-rings or rubber dampers on the contact surface with the gearbox are also used.
Never use it.

The shaft hole size is Φ8mm H7 (0 to +15μm). Use press-fit or adhesive depending on the bearing you are using.
When using anaerobic adhesives for bonding, the gearbox side is anodized and inert.
If the bearing side is also stainless steel, which is an inert metal, there is a high possibility that the adhesive will not harden.
Use an activator for inert metals.

The bearing hole is equipped with a rotation prevention protrusion, so the company's CNC ANTIROT bushings 3mm
It is compatible with.