The National Arms Company was a Brooklyn, New York–based manufacturer of firearms that flourished for a decade in the mid-19th century, around the time of the American Civil War.

[1] The Moore Caliber .32 Teat-fire, which used a unique cartridge to get around the Rollin White patent owned by Horace Smith and Daniel Wesson, proved very popular during the Civil War, with both soldiers and civilians.

Thus, it was akin to a rimfire cartridge, but instead of having priming all the way around the edge of the rim, it is centrally located in the teat.

[2] National Arms produced about 30,000 of the Caliber .32 Teat-fire revolvers from 1864 to 1870, when it was acquired by Colt's Manufacturing Company.

Colt continued to produce the .41 rimfire derringer after the acquisition as an effort to break into the metallic cartridge gun market.