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On a budget, if this is a g&g max gun, all you need is shim, piston (with corrected AoE) and spring. The max guns will already be really well upgraded, a m130 will probably put you around 430-440 fps.
Otherwise, Stealth's list is what I would do.
The g&g max should have a metal double O ring cylinder head already, and the gearset is pretty good. I've run my max socom at 24rounds/sec and it was fine, with an sp110 and a classic army metal rack piston, no other upgrades.
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