 The famous handgun author and revolver enthusiast Elmer Keith observed that the Luger design had been unfairly criticized by gun writers over the years as unreliable, partly due to poor experiences with Lugers constructed from salvaged parts.Keith noted that the Luger was a "natural pointer", one of the most accurate of all autoloading pistols—particularly at long ranges—and reminded critics that the Luger was the choice of more nations as their military sidearm than any other contemporary pistol or revolver.A number of countries purchased the Model 1900 Parabellum in 7.65×21 mm Parabellum (.30 Luger) caliber and issued the pistol on a limited basis to officers, non-commissioned officers and mounted troops, including Germany, Switzerland, and the United States.