+1 on conversion units. I got a Ciener Special 22 slide for my 1911 with 2 mags shipped, $204. Had to polish it a little to get it to slide right; now its great. Since I've only got the one 1911, its usually got the 22 slide on it. It's a matter of seconds to convert ... but I have to admit there are moments I wish I had a dedicated lower for it. Then again, its nice to have the exact same grip, not just one close to it, for training. I don't love cieners mags though, so perhaps with so many 22 1911s out there, we'll have some great options for 22 mags.