2 mm pinfire
Encyclopedia
The 2 mm pinfire is a one and a half inch pistol
Pistol
When distinguished as a subset of handguns, a pistol is a handgun with a chamber that is integral with the barrel, as opposed to a revolver, wherein the chamber is separate from the barrel as a revolving cylinder. Typically, pistols have an effective range of about 100 feet.-History:The pistol...

 that fires a 2 mm pinfire
Pinfire
A pinfire firearm cartridge is an obsolete type of brass cartridge in which the priming compound is ignited by striking a small pin which protrudes radially from just above the base of the cartridge....

 cartridge
Cartridge (firearms)
A cartridge, also called a round, packages the bullet, gunpowder and primer into a single metallic case precisely made to fit the firing chamber of a firearm. The primer is a small charge of impact-sensitive chemical that may be located at the center of the case head or at its rim . Electrically...

at a slow speed of less than 500 feet per second. Its energy is less than 1 Joule. Many 2mm rifles and pistols are made in limited quantities as collector items; usually priced at $500. The most common types are single shot and revolver.

Reference

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