You'd have your choice of structural type aluminum if we were in a post apocalyptic world.
I can't see the point of doing it this way because the challenge for most is the tooling and skill. If you can carve out a reciever now, you can probably do it with limited power.
Just hacksaw off a piece of good aluminum and take it home and work on it.
But then, there'd be no need for a ghost gun in a post apocalyptic world either... just scrounge up an AR15 and have at it, probably will be plenty of M4/M16 rifles laying around too.
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