G&P mechboxes aren't CNC, but they are really tough.
I think he means sorbo pads for shock absorbers?
And if you want a stock marui to shoot 380, you're going to need a sorbo pad for sure, new bushings, and probably a new gearset as well. But the piston can handle it for sure.
You're better off at 350 than 380 with a stock marui, keep in mind they weren't designed to go past 320fps.
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