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2.7 mm Kolibri Kolibri Pistol, 2.7 mm and .45 ACP cartridge Type Pistol Place of origin  Austria-Hungary Production history Designer Franz Pfannl Designed 1914 Manufacturer Kolibri Produced 1914 Specifications Case type Rimless, straight Bullet diameter 2.7 mm (0.11 in) Neck diameter 3.5 mm (0.14 in) Base diameter 3.6 mm (0.14 in) Rim diameter 3.6 mm (0.14 in) Case length 9.4 mm (0.37 in) Overall length 11.0 mm (0.43 in) Ballistic performance Bullet weight/type Velocity Energy 0.2 g (3.1 gr) FMJ 200 m/s (660 ft/s) 4 J (3.0 ft¬∑lbf) Source(s): Cartridges of the World [1] The 2 mm Kolibri (also known as the 2.7 mm Kolibri Car Pistol or 2.7x9 mm Kolibri) is the smallest commercially available centerfire cartridge,[2] patented in 1910 and introduced in 1914 by Franz Pfannl, an Austrian watchmaker, with financial support from Georg Grabner. It was designed to accompany the Kolibri semi-auto pistol or single shot pistol, both marketed as a self-defense weapon. Background The cartridge weighed 5.3 grams (82 grains), measured 3 millimeters (0.12 in) at its widest point, and 11 mm (0.43 in) from the base of the primer to the tip of the bullet. The cartridge headspaced on the mouth of the case. The bullet itself weighed 0.2 g (3 grains), and was estimated to have a normal muzzle velocity of 200 m/s (650 fps), resulting in a muzzle energy 4.0 joules (3 foot-pounds).[3] The round was not accepted overly well. The 2 mm Kolibri's small size made handling and loading individual cartridges difficult, and the bullet itself was fairly weak, literature at the time suggesting the round was capable of penetrating only 10-40 mm (0.5 to 1.5 inches) of pine board. The round also suffered some accuracy issues, since the technology of the time was incapable of applying rifling to the bore of such a small caliber, resulting in no spin on the bullet.[3] The series, and most weapons by Franz Pfannl, were discontinued in 1938. The cartridge (and related firearm series) is now a collector's item, with individual rounds going for over 70 United States dollars. Original guns for this round can sell for $5,000 USD.[citation needed] See also List of handgun cartridges 2 mm caliber Table of pistol and rifle cartridges by year References ^ Cartridges of the World 11th Edition, Book by Frank C. Barnes, Edited by Stan Skinner, Gun Digest Books, 2006, ISBN 0-89689-297-2 pp. 315, 530 ^ Barnes, Frank C. Cartridges of the World. DBI Books, 1976, p.146 ^ a b *Wilson, R. K. Textbook of Automatic Pistols, p.262. Plantersville, SC: Small Arms Technical Publishing Company, 1943.