A weaponized UUV has a sliding barrel and accessible breech. The barrel slides in response to the firing of a projectile, and moves a first distance un-arrested, providing time for the projectile to clear the barrel. After the projectile clears the barrel, a recoil mechanism engages the barrel, transferring the recoil load to the hull of the UUV.

A weaponized UUV has a sliding barrel and accessible breech. The barrel slides in response to the firing of a projectile, and moves a first distance un-arrested, providing time for the projectile to clear the barrel. After the projectile clears the barrel, a recoil mechanism engages the barrel, transferring the recoil load to the hull of the UUV.

A disrupter includes a barrel through which a projectile is fired; a barrel housing including a sleeve, the sleeve configured to receive the barrel and allow movement of the barrel therethrough; a frame on which the barrel housing together with the barrel may be selectively pivoted, the barrel configured to move relative to the frame during recoil of the barrel; and a stand on which the frame is supported, the stand including a pair of telescopic legs configured to extend in a direction parallel to a surface on which the disrupter is positioned, wherein telescopic extensions of the legs extend in a direction opposite a direction of firing; wherein the telescopic extensions are configured to extend prior to the firing and are configured to telescopically collapse during recoil of the barrel, the telescopic construction accompanied by a resisting force configured to absorb recoil energy as the telescopic legs collapse.