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Well....I just sent an email out to a couple of different gun manufacturers (glock, keltec etc) asking them if they could create a good/cheap/reliable 45 carbine with ability to use either the G21 mags, 1911 mags or XD(m) mags. Not to mention gave them a link to this topic to look at. I figure that if enough ppl ask about it the more they will consider it and potentially create it

Olympic Arms has upper receivers for ARs in 9mm, 40 S&W, 10mm and 45 ACP if that helps a bit and they make carbines as well that are AR based