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One of the biggest problems I see with using a 12 gauge is having enough space. Before you start adding baffles, etc., you need to account for the .45 diameter and the thickness of a barrel strong enough for the 45acp. Don't forget, you won't want any flex in a carbine-length .45 barrel, so it can't be super thin. I would think the outer diameter of the .45 barrel insert would be pretty close to the inner diameter of a 12 gauge. You might have 1/8th inch on either side of the od of the 45 barrel to play with - is that really enough for baffles?
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