6. Marlin Model 60 semi auto .22 LR approx. 11 million guns produced since 1960 ( only civilian firearm on the list) Orig. USA
5. K98 Mauser cal. 7.92x57 mm Mauser approx 14.7 million guns produced Origin: Germany
4. SKS cal. 7.62x39 approx 15 guns million produced Origin: Soviet Union
Number 1: Approximately 100 million since 1946 AK-47 Avtomat Kalashnikova type rifles have been made worldwide compared to approx 8 million M16s. Origin: Soviet Union
Runners Up include The Remington 870 pump shotgun at approx. 10 million and the Winchester 1894 lever rifle at 7.5 million.