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.
Variants.
THL 20.
Turreted cannon for helicopters.
POD NC 621.
Cannon pod for helicopters and light aircraft.
ARX 20.
Remotely controlled weapon station with M621 and a 7.62×51mm machinegun.
SH20.
Door mounted cannon for helicopters.
CP 20.
Pintle-mounted cannon for vehicles and boats.
15A.
Cannon for naval ships.
NARWHAL.
As remote-controlled naval gun on the Nexter Narwhal 20A.