Does this upper have a Ciener/Attchison style bolt? It has to be similar, because it will accept Black Dog mags.That'll work but you'll need a bcg conversion. Where as this upper comes with the correct bcg and all.
If it is a Ciener/Attchison style bolt, then all you have to do is remove the .22lr barrel collar and replace it with a .223 chamber adapter.
Here are some examples of the two different setups (and a sweet deal on a dedicated 4" .22lr barrel)...............
http://www.theoutdoorstrader.com/th...d-22lr-barrel-for-ar-15-pistol-or-sbr.898050/