Top Selling Pistols on Guns.com in 2020 The most popular category of firearms produced year over year, the semi-auto pistol also proved king in Guns.com s catalog in 2020, and we crunched the numbers to see who was on top of the trend. Of course, this Top 10 countdown is just a list of pistols we ve sold on Guns.com over the course of this wild year and is not based on industry-wide figures. Further, due to supply chain issues, it should be taken with at least a pinch of salt as some models were harder to keep in stock than others, which could account for several popular makes missing the cut.