A semi-automatic rifle is a type of firearm that automatically reloads after each shot but requires the shooter to pull the trigger for each round fired. This means that once a bullet is fired, the rifle uses the energy from that shot to eject the spent cartridge and load a new one into the chamber, allowing for quicker follow-up shots compared to manual-action rifles. These rifles are commonly used for various purposes, including hunting, sport shooting, and self-defense. Popular examples of semi-automatic rifles include the AR-15 and the Ruger Mini-14, which are known for their versatility and ease of use.