In my state you can only legally carry 3 specific guns. All at once or one at a time doesn't matter.
I generally carry a G23 gen 3, but sometimes a .38 snubbie. In theory the .38 could be a BUG to the .40, but I have always carried a reload instead.
And He said to them, “...whoever has no sword is to sell his coat and buy one." - Luke 22:36