In terms of armament, prior to 1937 the main weapons were twin machine guns. The early models had identical 6.5 mm machine guns, with one in the turret and one in the hull. Later, the primary weapon was a hull-mounted, manually aimed 13 mm Type 92 heavy machine gun, license-built from Hotchkiss. The weapon had limited traverse, but included a pivoting eyepiece on the gunsight optics and a high-angle mount, allowing anti-aircraft use. Secondary armament was a 6.5 mm Type 91 machine gun, replaced later by the 7.7 mm Type 97 light machine gun mounted in the manually traversed turret.