All guns are large enough to carry. Openly or concealed. You just have to dress according to the weapon, or have the right weapon for the occassion.

I conceal a full sized N-frame S&W revolver with no issues. Don't get caught up with small guns. Get the smallest gun you can shoot well.

Let's face it, if you can't hit the broad side of a barn with a mouse gun, you might as well carry a bigger rock to throw at the threat. People keep forgetting that shot placement matters the most, and you need the right gun to make that happen.