In the stock AK, the gears are fine. You just need metal bushings, a milder spring than you'd imagine, and a better spring guide than the original.
If you really want to spend extra cash you can buy a tightbore barrel and a better piston assembly.
It all depends on what you really want; dependability or velocity. A dependable gun that already fires between 350 and 400 fps with a mild upgrade makes sense to me. The rest does not.
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