... Several companies offer the ability to convert your standard 1911 into a carbine.
we have in the shop. My 'Smith got the conversion kit in trade for some project someone wanted to do. He also had an older model Kimber that wasn't doing much, so he built it up. It looks a little hokey, but it is actually pretty solid. I have not fired it, so I can't say one way or the other, but he says it's fun for the kids when they go to the range.
Here's a similar version:
Mech Tech CCU