A modular handgun is a type of firearm designed with interchangeable components, allowing users to customize various parts such as the grip, barrel, and slide. This modularity enables shooters to adapt the handgun to their preferences or specific needs, enhancing comfort and performance. These handguns often feature a core frame that can accept different calibers and configurations, making them versatile for various shooting applications. Popular examples include the Sig Sauer P320 and the Glock 19, which showcase the benefits of modular design in modern firearms.