Pardeep
๑۩۩๑┼●ℛŐŶ
The Hummingbird Pistol
It seems that the word "kolibri" is found in many European languages. It means "hummingbird".Back in 1914, an Austrian watchmaker named Georg Grabner marketed an autoloading pistol under that name. It has the distinction of being the smallest auto pistol ever made.
That is a 5 round magazine next to a 3mm cartridge. That translates to a .11 caliber bullet.
The tiny 3 grain bullet has a muzzle velocity of about 650 feet per second. That means that the gun has about 1/2 the power that my air pistol produces. The projectile is so small that it would certainly penetrate if you shot someone's bare skin, but it also means that I really can't conceive of it doing anything but pissing an attacker off. Unless you managed to shoot his eye out, of course.
"Grabner decided to make a miniaturised version and promote it as a self defence-gun for ladies, capable of being carried in any handbag or purse. What the lady was to defend herself against is open to some question; the 3-grain bullet produced about two foot-pounds of muzzle energy, which would probably have proved decisive against an enraged cockroach."