A term coined by gunwriter Robert T. Shimek to denote the modern breed of 9mm Parabellum auto pistols of recent design, usually featuring high magazine capacity and a double-action trigger mechanism or other modern ignition system (e.g., the squeeze-cocker of the Heckler & Kock P7 series or the Safe Action of the Glock).

Wonder Nine refers to any semi-automatic pistol that is chambered in 9×19mm Parabellumand has a staggered column magazine, as well as a double-action trigger for at least the firstshot.  The term was coined by firearms author Robert Shimek, and became popular in Americanfirearm-related magazines during the 1980 by those advocating for their use by police forces.

HK P7 HK P7 Wondernine