Nobody can give you any advice unless you say what exactly you're trying to upgrade. Do you want in improve its range? Trigger response? Rate of fire? Ergonomics? How much are you willing to spend?
Unless you have a specific picture in mind of what you want to accomplish, you're better off just leaving it stock.
Edit: I should also point out, 'on a budget' and 'upgrade' do not coexist easily. To get a noticeable improvement in virtually anything, you're going to see the costs rise pretty quickly because you're upgrading a whole system, rather than just dropping in one part.
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Airsoft is where expensive things go to die.
Last edited by Bellerophon; December 9th, 2014 at 11:24..
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