Welcome Argie!
Yes they'll fit... the .223 would be an SB-2 frame which is the stronger, rifle-rated version vs. the SB-1. Any of the lower pressure (shotgun) bbls. can be fitted.
Take some time and pore over the "stickies" at the top of this department... almost everything you could ask is answered there.
The Gurus here at GBO will have lots of info and guidance to offer as well.

Steve