The guns will be used on San Antonio class (LPD-17) ships and Littoral Combat Ship class vessels. The contract is worth $25.7 million. Deliveries are to begin in September 2014.
"General Dynamics Land Systems is committed to providing cost-effective mission-critical products and services to the Navy's surface warfare fleet," said Michael Bolon, senior vice president, U.S. Marine Corps and Navy business sector at General Dynamics Land Systems.
"The MK46 gun system's open architecture software supports stand-alone and integrated variants for multiple uses and maximum flexibility."
The MK46 is a fully stabilized system. It is lightweight and modular and is the main deck gun for LPD-17 ships. On Littoral Combat Ships it will act as a secondary gun battery.
General Dynamics said it has delivered 30 of the systems to the Navy since 2005.
Work to produce the weapons systems will be performed at company facilities in Virginia, Florida, Ohio, Maryland, Michigan and Pennsylvania.