In the early 80s I bought a TC Super 14 Contender in 223 caliber. Handguns have been available for the caliber for decades.
Small world, funny you should post that. It was my exact first thought seeing as I have my TC standing in the corner of my office with the .223 barrel configured as a rifle and the handgun barrel and stock in my desk drawer.
Side note, SGammo.com has some left if people are looking, they are asking almost 3x what I just bought 1k rounds of two weeks ago though.