MK 38 25-mm machine gun
The 25mm Machine Gun System (MGS) Mk 38 is a 25mm automatic gun system that provides ownship with defensive and offensive gunfire capability for the engagement of a variety of surface targets. It is designed to provide close range defense against patrol boats, swimmers, floating mines, and various targets ashore including; enemy personnel, lightly armored vehicles and terrorist threats. One crewman is required for operation and two for maintenance.
This system consists of the M242 auto-cannon and the Mk 88 machine gun mount. The M242 auto-cannon is an externally powered, dual-feed, single-barrel weapon which may be fired in semi-automatic or automatic modes. In the automatic mode, the rate of fire is approximately 175 rounds per minute. The M242 does not depend on gases for operation but instead utilizes an electric motor, located in the receiver, to drive all the moving parts inside the cannon. Ammunition feeding, loading and firing, extraction, and ejection are all done by the motor. The Mk 88 machine gun mount train and elevation is controlled manually by the gun operator. In the event of a major malfunction, the M242 auto-cannon can be removed from the mount and another auto-cannon installed in five minutes by two people.
The Mk 38 machine gun system (mgs) was employed aboard various combatant and auxiliary ships in the mid-east force escort operations and during operations desert shield and desert storm. The weapons are maintained in a rotatable pool, available for temporary installation on various deploying ships and permanent installation on certain amphibious and auxiliary ships, patrol craft and coast guard cutters. Designed and assembled by crane division, nswc, it has been in service since 1986. The mk 38 mgs is an unstabilized, manually pointed, deck mounted cannon with semi-automatic and automatic modes of fire.
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