The Type 1 Chi-He's 47 mm high-velocity gun had a barrel length of 2.250 mm, a muzzle velocity of , and a penetration capability of 55 mm/100 m, 40 mm/500, 30 mm/1,000 meters; over double that of the Type 97s low-velocity main gun. It was more reliable and more accurate, with the gun barrel having a 16 groove rifling and an improved firing mechanism. The gun did require the installation of elevation gear (on the earlier Type 97 the gunner had to physically move the gun up or down on his shoulder). In light of these improvements, the gun was adequate against Allied armor. The ammunition was the same as used with the anti-tank version of the gun. The tanks carried 120 rounds of ammunition with both armor-piercing and armor-piecing high explosive shells. The gun was placed in a three-man turret, which had space for the commander, gun-layer and loader. The gun could be elevated and depressed between +20 and -15 degrees. This gun was used in the Type 97-Kai Shinhoto Chi-Ha tank, and on the Type 3 Ka-Chi Amphibious Tank.