Interesting but a little unhandy for very little gain,
I remember when Gibsons discount store sold a little two shot .22LR pistol called the gaucho. It was sort of like a tiny double barrel shotgun. There was a hammer for each barrel and they were single, er double shot. Also a trigger for each barrel.
To fat for CCW. Looks like something that would be unlocked in Hitman called Ballers, or GTA5.