Full House was in its second season, Miami Vice was really getting stale, and the Austrians were making plastic guns, which as we all know, go right through airport metal detectors without a peep.
Don't forget about the Glock-7, it was ceramic. (well that was 1990 but it still comes up from time to time).
You can make a functioning AR lower out of a block of wood or a hunk of plastic and an LPC. It will function for a little while anyway. I think these would be preferable to a 3D printer.