Never shoot .223 after using .22 lr adapter even manufacturer says anything !
I have changed several barrels ruined that way with CMMG / Ciener. Chrome plated barrel may get f****d up with just one .223 round after using .22 lr and without cleaning barrel and chamber very carefully.

Like Hoser said, get separate .22 lr upper. I have good experiences with V22 but Spikes looks nice too.