The M621 is a 20 mm automatic cannon of French design, developed by Nexter as on-board armament for armored vehicles, aircraft, helicopters and small coastal vessels of the French Navy.
Turreted cannon for helicopters.[1]
Cannon pod for helicopters and light aircraft.[2]
Remotely controlled weapon station with M621 and a 7.62×51mm machinegun.
Door mounted cannon for helicopters.[3]
Pintle-mounted cannon for vehicles and boats.[4]
Cannon for naval ships.[5]
As remote-controlled naval gun on the Nexter Narwhal 20A.[6]