The Giat Industries 30 mm Model 781 is an externally powered weapon firing 30 mm ammunition of the 550 family. It is a single feed weapon intended for arming light aircraft, helicopters, armoured and soft-skinned vehicles.

The mechanism drive and timing is imparted by a cam mechanism and electronic controls are provided to control the rate of fire which may be varied to suit the mounting in use.

Single shot, limited or unlimited bursts are possible. The first production application for this weapon is the HAP cannon turret designed to be installed on the Eurocopter Tiger attack helicopter. The German version will have a different cannon, the Mauser RMK 30 mm.

For trials purposes Giat Industries has recently developed an external mount for the 30 mm Model 781 automatic cannon which has been mounted on the roof of the AM General High Mobility Multipurpose Wheeled Vehicle (HMMWV) (4x4). This version has been developed for the export market. As of mid-1999 there were no land systems production applications for this 30 mm cannon.

Preproduction models undergoing trials. First production application for this weapon will be the French version of the Eurocopter Tiger attack helicopter.