yeah they have had those for awhile... basicly you have to have a fixed mag... BTW they are very ez to convert to the reg AR-15 style. just don't get cuagh with it or its same as haveing a REAL AR-15.... If you want a nice semi in .223. buy a mini 14... then ship it off to a good gun smith, who "work magic" on every part but where the serial #s are... OR move to OR and walk out with one ....