The Rohm RG10 is a 6 shot revolver chambered in .22 LR. This gun is formerly manufactured and sold by Röhm Gesellschaft of Sontheim/Brenz, Germany, who also made its brother, the RG14. The RG14 was used in the failed assassination of US President Ronald Reagan in 30th of March 1981.
This firearm is reputable for its cheap quality, typical of guns made by its manufacturer. They were banned for import in the USA thanks to the Gun Control Act of 1968.