Classic Army
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Classic Army's CNC wire cut steel gear set replaces the bevel, spur and sector gears in a Version 2 gearbox. Wire cutting removes material from solid steel stock rather than casting it, which gives each tooth a precise profile that matches its neighbors, so the load spreads across the whole face instead of concentrating at one point. That's what separates a set that survives a heavy spring. It's listed for Gen 2 Nemesis DT4/X9/LS12 rifles, but the compatibility field says any Tokyo Marui spec M4/M16 Version 2 gearbox, so confirm the fit for your specific gun before ordering. Whatever it goes into, install the full set rather than mixing in old gears, re-shim from scratch, and set the motor height by ear until the whine goes without the motor sounding loaded.