65 mm L/17 Cannon Model 13

The 65 mm gun was first accepted into service with Italian mountain troops in 1913, and it served with them throughout World War I. It was used in the Fiat 2000 heavy tank which saw action in Libya. Replacements arrived in the 1920s and the gun was transferred to the regular infantry. It was well liked by the infantry due to its minimal weight and high reliability in adverse conditions. Despite its light calibre, it served through World War II with Italian forces as a close support weapon. It was effective also mounted on truck, particularly on captured Morris CS8 in North Africa, as anti-tank artillery. Guns captured by the Germans after the Italian defeat were given the designation 6.5 cm GebK 246(i). Some were fielded by the Ecuadorian Army during the Ecuadorian–Peruvian War.

A lightweight design, the 65 mm gun was designed for use in difficult terrain and extreme weather conditions. The barrel had a 17 calibre length, and was designed for firing low-trajectory shots. The carriage was likewise simple in nature, consisting of a single trailing arm and solid-rim spoked wheels for horse draft. The weapon could be broken-down into five loads for transport. A simple folding gun shield was also provided in 1935.