APS-2 comes with a fixed hop up set for use with Maruzen 0.29g Super GrandMaster BBs. You'll need the PDI hop up unit, which mounts on an AEG barrel and uses AEG hop up rubbers. I get my rubbers (the Guarders) from airsoft parts. Just send Jugglez a PM to say you want a couple sets (about $10 each I think) and he'll bring some in on one of his next orders. If it's not in stock, just ask. He gets orders from each company in at least once per month.
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