Lancer Tactical
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It's a tiny screw in a small bag, and it's the single fastest way to derail a gearbox repair if you don't have one. The gearbox body pin screw is what holds the body pin in place inside a Lancer Tactical Gen 3 M4 AEG — without it, the pin walks out, the shell loses alignment, and you're suddenly looking at an air leak and a piston that won't seal properly.
People usually need this part when they're already halfway through splitting their box for something else — a spring swap, a cracked shell, a new cylinder head — and find the screw stripped, missing, or just too worn to trust. OEM replacement is the right call for Gen 3 guns because aftermarket shells and castings vary in their pin hole dimensions, and a mismatched screw won't seat the way it should.
If you're already pulling your gearbox apart, throw a few spare body pin screws in the parts tray. They're cheap to replace and expensive to hunt for at 8 PM on game day.