Derringer

Palm Pistol, Pocket Pistol.
The pictures captured from " Tiny Weapon - Modern Marvels ".

Grenade. Bigger isn't always better.

Rifling. The process cut the groove inside the gun barrel.

The groove made the bullet spin increasing stability and accuracy in flight.

Derringer is used for Lady self-defense.

.22 Short. North American Arms.

Mini Fire Pistol.