Take a pistol cartridge. Make a rifle chambered for it, so that it gains power and velocity from the longer barrel, and accuracy from the longer sight radius.
Then cut the stock off that rifle, so that you lose some of the accuracy due to bracing against your shoulder. Then cut the barrel down, so you lose most of the power you gained, and most of the accuracy from the longer sight radius.
And yet, you still need two hands to operate this contraption, unlike a pistol.
Never understood the whole concept of the Mare's Leg. Might make some sense if it was chambered in a rifle round, but if chambered for a pistol cartridge, why not just use a pistol?
Fun gun? I'm sure it might be. But kind of a silly concept for a bounty hunter, and doesn't seem practical for anything