What firearms ejects the casing immediately after a round is fired?

Semi-automatic and automatic firearms eject the casing immediately after a round is fired. In these firearms, the energy from the fired round is utilized to cycle the action, which ejects the spent casing and chambers a new round. This process occurs rapidly, allowing for quicker follow-up shots compared to manual actions like bolt-action or lever-action firearms. Examples include handguns, rifles, and submachine guns designed for this function.