The AR-15, initially developed by Eugene Stoner in the late 1950s, is a versatile and modular semi-automatic rifle. It can be chambered for various cartridges. Widely recognized as a civilian firearm, it has several iterations, including the civilian AR-15 and the military M16. Renowned for its adaptability, it has extensive use in civilian, law enforcement, and military applications. The AR-15's legacy is marked by its modular design and significant impact on contemporary rifle development.