General Dynamics Armament and Technical Products has been awarded a contract to exercise an option to procure 22 M61A2 20mm lightweight Gatling gun systems.

The $7.8m contract is a modification to a previously awarded firm-fixed price contract by the US Navy in support of the F/A-18 E/F strike fighter programme.

The F/A-18 E/F is a Boeing-built Super Hornet with a twin-engine, 4.5-generation carrier-based multirole fighter aircraft equipped with an internal 20mm gun, air-to-air missiles and air-to-surface weapons.

Work will be carried out at the company’s facilities in Vermont and Maine, US, and is expected to be completed in April 2013.

The US Naval Air Warfare Center Aircraft Division will be the contracting activity.