A weapon system includes a recoiling mass and a cradle, the recoiling mass including a weapon barrel and a breech ring and translating relative to the cradle during firing, and a guide device being provided for guiding this recoil movement of the recoiling mass. This weapon system is characterized in that the guide device includes at least one bar that is secured to the cradle and extends to the rear of the weapon system, the bar cooperating with at least one rail carried by the breech ring. The breech ring is connected to the cradle by two pairs of hydraulic or pneumatic recoil brakes, each rail being arranged between two brakes of the same pair, the body of each brake being secured to the breech ring.