10 is better still.If all semis were banned, I'd have to carry a snubby .38, probably my S&W Bodyguard .38.
I no longer have my two 642s but I liked them a lot, too. Other revolvers would be too big for me to carry.
Five would be better than zero.
Stay evenly balanced like my wife does, a 642 in each jacket pocket and one for each hand. She prefers revolvers. I shoot with both hands and teach all my clients to do the same.
As for me, I will continue to carry my G17 Gen. I, because banning semi-autos is unconstitutional.