I sold one of those recently. Decent gun but you have to be aware of its limitations. You will NOT be able to use one scope setting for both the rifle and shotgun unless you get very lucky and the barrels just accidentally happen to be well regulated. The vast majority don't have well regulated barrels so their points of impact will be vastly different.
On mine, I used a sight-thru mount and put taller front and rear sights on it to show over the scope base. That way, I could sight in the rifle with the scope and the shotgun (with turkey loads) using the iron sights.
Can I ask why you sold yours?
I sold one of those recently. Decent gun but you have to be aware of its limitations. You will NOT be able to use one scope setting for both the rifle and shotgun unless you get very lucky and the barrels just accidentally happen to be well regulated. The vast majority don't have well regulated barrels so their points of impact will be vastly different.
The more I think about that .223/12ga combo, the more I am at a loss for an idea of what I personally would do with it if I had one. But it's still cool
I would go with a simple 4 X optimized for the .223, but try hard to get a quick-detachable arrangement to switch to the shotgun mode