Abstract: A single-shot rifle having a receiver with a lever-activated falling block action characterized in that the breech-block carries the firing pin, the hammer, the hammer spring retainer, the toggle link which is linked to the lever, and the trigger whereby the entire assembly may be removed from the receiver for cleaning, servicing, or replacement simply by removing the lever-receiver pivot pin. The rifle herein is further characterized in that the receiver has therein an extractor-ejector mechanism which is actuated by the breech-block movements.