 Already having a large chassis, the AMX 50 could in principle easily be adapted to carry the desired 120 mm gun — a derivation by the "Atelier du Havre" of the American gun, using the same ammunition — and had the advantage of a very powerful engine.In practice there were many obstacles.Room could in fact only be found by increasing the height of the lower turret half, negating the advantages of the oscillating concept and creating a dangerous shot trap.