Why these are the worst of the worst.
Handheld firearms have existed in one form or another since the 13th century. Despite their long history, there have been relatively few real, genuine clunkers in the world of handguns. The close engagement range of handguns—typically zero to twenty-five feet—means that a handgun operator will often have little or no chance to clear a jammed weapon, and therefore complete, absolute, unqualified reliability is a must. Nevertheless, some handgun clunkers became famous, popular, or both.
Nambu:
The Nambu is one of the worst pistols ever designed. At first glance, Japan’s first semi-automatic pistol design resembles the iconic German Luger P-08—though the comparison stops there. Designed by Kijiro Nambu at manufactured at Tokyo’s Koishikawa Arsenal, the Nambu was meant to provide Japan’s armed forces with an indigenously designed and produced handgun.