The GCT 155mm AMX AUF1 is based on the AMX-30 main battle tank (MBT) chassis. Self-propelled artillery equipped with a 155mm 39-caliber gun with an auto-loading system, giving a rate of fire of 8 rounds per minute, and a sustained rate of fire of 6 rounds in 45s. It is also equipped with a roof-mounted 12.7mm anti-aircraft gun. The AUF1 has an effective range of 23,500 meters firing conventional rounds and 28,000 meters using Rocket Assisted Projectiles (RAPs). The first production AUF1s were delivered exclusively to the Saudi Arabian Army, while the French Army received their first deliveries in 1980, deploying the GCT 155mm AUF1 in regiments of 18 guns each.
In addition, the Iraqi Army received a number of GCT 155mm AUF1 variants in 1980, which they employed during the Iran–Iraq War. A battery of 8 AUF1s from the French Army’s 40em Regiment d’Artillerie was deployed in support of the Rapid Reaction Force on Mount Igman during the 1995 NATO bombing campaign in Bosnia and Herzegovina. The battery provided rapid counter-battery fire against Serb artillery units during the siege of Sarajevo, the long range of its guns allowing it dominate the surrounding terrain.
The GCT AUF2 is an improved turret for the GCT 155mm designed and built by GIAT. The AUF2 155mm howitzer and turret are designed for integration onto a wider range of armored chassis such as AMX30, Leopard 1, Arjun and T-72. It was initially developed to upgrade the 155mm GCT AUF1 self-propelled howitzers then in service with the French Army. The French Army has procured approximately 70 AUF2 turrets and mounted them on the AMX30B2 chassis. Compared with the AUF1, the AUF2 offers a significantly improved range of 42 km, a higher rate of fire of 10 rounds/minute and multiple rounds simultaneous impact.