How many different types of guns are there in the world?

There are thousands of different types of guns in the world, categorized into various classes such as handguns, rifles, shotguns, and machine guns. Within these categories, there are numerous models and variations produced by different manufacturers, each with unique features and specifications. Additionally, factors like caliber, action type, and intended use further diversify the types of firearms available. Overall, the exact number is difficult to pinpoint due to the constant innovation and production in the firearms industry.