The closest you can get to an HPA mag is HPA tapping a GBB mag, but that's really pointless in my opinion. You get: Heavy mags with low capacity, A hose running to your gun, a hose that you will have to disconnect and reconnect to a new mag for every reload, and all the possible jams that can happen with a GBB.
While I think that an HPA gun is a bit silly with the hose, I think that an HPA tapped GBB is completely ass-backwards and I have no idea how the idea came about.
I got off-topic. In short: no, HPA mags aren't really a thing.
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I own more GBB guns than AEGs, because I'm a stubborn bastard who hates doing things the easy way.
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