The AR-15 platform refers to a lightweight, air-cooled, gas-operated semi-automatic rifle design. Originally developed by Eugene Stoner in the late 1950s, it has become popular for civilian use due to its modularity and versatility. The platform allows for various configurations, including different calibers and accessories, making it adaptable for various shooting applications. The AR-15 is often used for recreational shooting, hunting, and home defense. Its design features a direct impingement gas system, which helps reduce recoil and improve accuracy. Due to its widespread use, the AR-15 has also been a focal point in discussions about gun control and firearm regulations in the United States.