A weapon system incorporating a barreled weapon, which is supported in a rotatable turret dome of an armored vehicle so as to be pivotable about trunnions in the direction of elevation, which can be loaded with projectiles from the armored vehicle, and wherein the base of the barreled weapon rests at its bottom on a rail which is circular in its radius relative to the axis of the trunnions. The barreled weapon is constructed as a front-loader weapon, and possesses outside of the armored vehicle a forward barrel segment which is separate from the weapon barrel and adapted to be latched with the latter, and which is rotatable about the trunnions up to contacting end stops.