In the novel Spidersilk, Mark hosts a large and in charge party to celebrate his new house. After getting the party started he slips away to the bathroom and ends up pulling out and cleaning a gun filled with tear gas bullets. These guns are also in our world and are popular in nations that don’t allow the use of guns with actual bullets. If you’d like to know more about the Izh-79 weapon, or something at least similar to it, Mark had concealed to keep the party under control, this link is pretty helpful.

http://www.makarych.ru/eng/index.htm