1930s - 40s
World War II
Length of tube : 2.52 m (8.26 ft)
Rifling: 16, right-handed
Penetration at 1000m : 45 – 60 mm (1.77 - 2.36 in)
AC 47 anti-tank gun Wikipedia
The AC 47 was a French anti-tank gun of 47mm caliber. It was principally used in the ouvrages and casemates of the Maginot Line in the late 1930s; another version was created for naval use.
The AC 47 was principally used as a defensive weapon, since its portability was intentionally limited to prevent the weapon from being turned on defending troops if a fortification was captured.