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The only things on the marker you might want to look at changing are the feedneck and the barrel. Instead of an expansion chamber perhaps look at an inline regulator and macro line which you'll need, but that'll depend on the use you'll give it, but given it's a sonix i'm assuming it's for occasional play so neither is absolutely necessary.
Otherwise the marker in itself is ok.
Hoppers, it's all a matter of personal preference, since it's not an electronic marker, the ROF is decent but don't expect much, so a standard VL 200 gravity loader should suffice.
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