I too thought of building a dedicated lower, and I have 2 spares, to make 2 complete guns. But 1 is a Les Baer matched slide and frame, and needs to stay a center fire. The other however is a Safari arms match master, and I could certainly see it as a .22, as I only have 200 bucks in it, I could sell the slide for 75. HMMMM, keep talking.