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You wouldn't WANT a G&G full tune up kit lol
If your just upgrading the spring, buy a systema M100, thats around 350fps for you.
If you wanted it to shoot 400fps, I recommend a new gearbox shell, piston, piston and cylinder head, bushings, and gears.
It might be better for you to buy a systema complete mechbox if you can afford it.
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