Someone is supposed to be making a true 1911 Colt stamped .22lr, but I can't remember who. It's going to be priced aroud $400, and they are going to make a GI and a Tactical. I saw them in American Rifleman or one of the hand gun mags. I'll have to look around a bit to see if I can find the article unless someone else knows who was going to offer these...... Shoo
If you do not already own a 1911 centerfire then I understand ruling a conversion unit out. But if you already own a 1911 a Kimber Conversion is on sale at Midway for $289 in silver or matte finish. It takes only a couple of minutes to swap slides and you have 10 shot .22LR that will shoot itty bitty groups. Also no FFL paper work as the frame is all thats registered. Something to keep mind in our current political climate.