The main armament consisted of a GIAT 120 mm CN120-25 model G1 smoothbore gun. The main gun ammunition load was 37 to 40 rounds depending on the prototype. Up to 17 rounds can be stored in the turret, 14 of those are stored in a sealed compartment inside the turret bustle fitted with blowout panels. Ten of them are loaded in two electrically-operated drums. The rest of the rounds were stored in a large rack to the right of the driver. The tank could fire a variety of NATO 120 mm ammunition, including the French OCC 120 G1 HEAT round and the OFL 120 G1 APFSDS round which are suitable for all NATO 120mm smooth bore gun. The OFL 120 G1 was capable of penetrating 420 mm of RHA steel armor at 1,000 m range.