There are civilian versions of the AK-74 available in Europe that ARE chambered in .223,as well as in 7.62x39. I have no idea if they are available in the US or not.
The Romanian SAR-3 is a .223 version of the AK-74. Century Arms imported many of these rifles into the U.S. Of course some U.S. parts were added to comply with the new "assault weapon" laws.