Gun Wiki

The ASP Automatic Cannon (ASP short for "Automatic Self-Powered"), also known as the ASP-30 Combat Support Weapon, was an American 30mm autocannon developed as a crew-served and vehicle-mounted weapon intended for use against enemy APCs and infantry vehicles, as well as ground fire suppression.


Development of the ASP began in the middle of 1984. In October 1984, the ASP fired its first rounds.

In the Spring of 1989, The Boeing Company, known at the time as McDonnell-Douglas Helicopter Systems, signed an agreement with Royal Ordnance. Under this agreement, Royal Ordnance would have exclusive sales and marketing rights of the weapon throughout the world, with the exceptions of Argentina, Israel, South Korea, and the United States of America. These latter countries remained under the responsibility of McDonnell-Douglas.

By mid-1989, three prototypes were built and had fired over 20,000 rounds of ammunition. The prototypes were then followed up by twenty preproduction samples.

Demonstrations of the weapon were held in the U.S., Europe, and in the Middle East. In its first public demonstration, the ASP replaced the M2HB Browning on an M113A2 APC, hitting stationary targets at ranges of up to 1,500 meters.

Ultimately, the ASP did not progress beyond the preproduction stage due to economic reasons.


The ASP is a gas-operated autocannon with a rotating bolt, in addition to built-in dual-acting recoil adapters that allows the weapon to be fired semi-automatically or in full-auto at a cyclic rate of 400 to 450 rounds per minute. Some sources claim that it is 500 rounds per minute. Attached to the front of the barrel is a 10-baffled blast suppressor.

It was designed as an upgrade to the M2HB Browning heavy machine gun and the Mk 19 grenade launcher as a vehicle-mounted weapon. When used with a soft recoil cradle, it can be mounted on the same tripod as used by the M2 Browning for ground fire suppression. Being a gas-operated weapon, it is mount insensitive, meaning that it could be mounted either on a vehicle or a tripod.

The weapon is belt-fed, and ammunition is fed into it from the left-hand side. The short length behind the feed permits simplified and fully controlled "spade grip" firing from cupola mountings.


It fires 30×113mmB ammunition, in particular, the M789 HEDP (High Explosive Dual Purpose), M788 TP (Target Practice), and M799 HEI (High Explosive Incendiary) rounds. It is also capable of firing the ammunition that is used by the British ADEN Mk IV and French 30mm DEFA autocannons.


External Links[]