7mm “Baby” Nambu

Wednesday, December 4th, 2019

7mm “Baby” Nambu

As a young Lieutenant in the Japanese military, Kijiro Nambu was assigned to the Tokyo Arsenal to work under weapons designer Nariakira Arisaka on the Type 30 rifle project. Within a few years he promoted to the rank of Major and was put in charge of semi-automatic pistol development. His first design was the 8mm Type A pistol was completed in 1902 and bears his name.

There were design issues with the Type A and in 1907 Kijiro introduced the Type B pistol. While he was able to improve on the design flaws of the Type A; the Type B was never adapted by the Japanese military. It received praise from the military, but was considered too small of a caliber for service use as its performance is comparable to the .25 Auto developed by John Browning in 1900. It was very expensive to manufacture and during this period of time Japanese officers were required to purchase their own side arms and it quickly became more of a status symbol among the wealthier officers.

The Koishikawa factory (aka the Tokyo Arsenal) manufacture about 6,000 of the Type B Nambu’s until 1923 when the Great Kanto earthquake damaged the factory. Production was then moved to Tokyo Gas and Electric, which produced another 550. In the 1930’s Kijiro opened a factory called Nambu Arms Manufacturing Company where he began development of the Type 94 pistol.

The Type A Nambu is commonly referred to as the “Grandpa Nambu” and the Type B is commonly referred to as the “Baby Nambu”. The 7mm “Baby” Nambu is capable of propelling a .280” dia. 56 grain bullet at 1,050 fps with 137 ft.-lbs. of energy. It was manufactured from 1907 until 1929.

Roberson Cartridge Company is a custom manufacture of Vintage, Obsolete, Hard to Find and Wildcat calibers.

Order Here