JG Version 2 & Version 3 Stock Full Metal Airsoft AEG Gear Set

A whining gearbox that loses efficiency between games usually means worn gears. The JG Version 2 and Version 3 Full Metal Gear Set is the fix — a stock-ratio replacement set cut for the two most common AEG shells in the hobby.

Full metal construction throughout means these handle normal spring loads without the deformation and chipping that kills plastic gears. The set fits both Version 2 and Version 3 gearboxes, covering the vast majority of M4-pattern and AK-platform rifles. Same shaft diameters, same spacing — drop them in and shim.

Stock ratio, stock job. This is a replacement set, not a speed or torque upgrade. The ratio matches factory specs, so it restores a worn gearbox to its original character rather than changing it. If you want to shift velocity, change the spring first, then pick a gear set built for that ratio.

Shimming is the step that matters. Gears that sit too tight whine. Gears with too much clearance slap. A well-shimmed set meshes face to face, runs quiet, and survives. The stock gear pattern in these isn't designed to save a badly worn shell — it's designed to make a serviceable shell run right again.

Before you buy. The sector gear tooth count varies by spring weight, so make sure your set matches what the gearbox was built for. A wrong-tooth sector strips on first pull. If the rest of your internals — motor, piston, cylinder — are in rough shape, upgrading them alongside the gears saves you a second teardown in a month.