MK guns, in service around the world, first came into service in 1966. They are manufactured by Bofors, a subsidiary of BAE Systems Sweden.
The guns can fire four rounds a second and can quickly switch ammunition types for combating air, land, and sea-based threats.
"This contract award further strengthens our strong position in the naval guns market," said Lena Gillstrom, managing director of Weapon Systems, Sweden, at BAE Systems. "This competitive win shows that BAE Systems' world-leading 57mm naval gun and ammunition systems continue to be selected as the best solution for both new and existing customers around the world."
BAE Systems Sweden said production of the weapons will begin immediately. Deliveries are to begin next year and continue through 2017.
The value of the contract was not disclosed.