General Dynamics Armament and Technical Products, Williston, Vt., is being awarded a $7,789,950 modification to a previously awarded firm-fixed-price contract (N00421-10-C-0024) to exercise an option for 21 M61A2 20mm Lightweight Gatling Gun Systems in support of fiscal 2012 F/A-18 E/F aircraft.  Work will be performed in Williston, Vt., and is expected to be completed in February 2014.  Contract funds will not expire at the end of the current fiscal year.  The Naval Air Warfare Center Aircraft Division, Patuxent River, Md., is the contracting activity.