The term was coined by firearms author Robert Shimek, and became popular in American firearm-related magazines during the 1980s and 1990s by those advocating their use by police forces. At the time most American police departments were still using revolvers, chambered in cartridges such as .38 Special and .357 Magnum.
The simplicity of being able to fire the first shot just by pulling the trigger, a feature of double-action revolvers, and a higher ammunition capacity (12–18 rounds, more than twice that of a revolver), are the "wonderful" features of a wonder-nine.
- Buffaloe, Ed; Bill Kelsey. "The M.A.B. PA-15 Pistol". Unblinking Eye. Retrieved 22 August 2015.
- Trzoniec, Stanley W. (1981). Modern American Centerfire Handguns. Tulsa, Okla.: Winchester Press. p. 49. ISBN 0876913419. OCLC 7572377.
- Hartink, A. E. (2002). The Complete Encyclopedia of Pistols and Revolvers (first ed.). Edison, N.J.: Chartwell Books. p. 279. ISBN 9780785815198. OCLC 51024327.
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