Abstract: An over-under firearm having a breech block, a barrel block, at least one shot barrel mounted in the barrel block and a rifle barrel superimposed on the shot barrel at a small angle relative thereto, and a hinge mounting the barrel block to the breech block to afford pivoting about a vertical axis for loading and unloading.

Abstract: An over-under firearm having at least one shot barrel and a rifle barrel superimposed relative to one another and mounted in a barrel block designed to pivot relative to a breech frame so that the rear ends of the barrels are disposed laterally for loading. The breech frame surrounds the top, bottom and one side of the barrel block, and arcuate ribs and grooves are provided between the top and bottom of the barrel block and the breech frame. A breaking mechanism is provided to displace the barrel block laterally after the barrel block has been unlocked from its operating position in the breech frame. A mechanism is provided for withdrawing the firing pin and cocking the hammers in response to further movement of the barrel block relative to the breech frame.