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if its got a plastic cylinder head then you'll have to at least change that, possibly the piston too. Otherwise replace stuff as it breaks.
Should be noted, if you're going up to 550fps, you'll need to use at LEAST .36-.43g BBs to get any decent range and accuracy.
At 450 you should use .30, .32 or .36
Don't forget to upgrade the hop and barrel if you want better accuracy as well
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