A strong base for your next build
The APS M4 V2 Gearbox Shell in quick-change form gives technicians a reinforced alloy foundation for M4, M16 and AR-type AEGs. Rather than a bare box, it arrives with 8mm bearings and the selector plate already installed, plus a spring guide, so more of the fiddly assembly is done before you begin.
Tune power in seconds
The headline feature is the quick-change spring system. It lets you swap the main spring from the rear of the gearbox to adjust muzzle energy for different site limits, without the full teardown a conventional shell demands. For players who game at multiple venues, that flexibility is invaluable.
Made to take the stress
8mm bearings support the gears and help the mechbox handle the loads of an upgraded setup, while the reinforced alloy shell resists the flex and cracking that plague weaker boxes under a stiff spring. It is a dependable platform for a reliable, higher-output AEG.
Build it or let us do it
Assembly is a job for a competent technician with the right tools. If you would prefer expert hands, our in-house airsoft repair service in Kent can build and tune it for you. Find more internals in our airsoft accessories range.
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