Limited numbers of the early Type 100 model were delivered to the Solomon Islands in late 1942 for military trials. A small batch was delivered to Guadalcanal, but the rest of the shipments were sunk before reaching their target. A few very early models, without the muzzle brake, but with a bipod and a sight up to 1,500 meters (the "cavalry variant" of the Model 3B), were captured by the British in the late stages of the Burma Campaign, brought in by Japanese reinforcements. Of the paratrooper variant, some were captured on Luzon during the Philippines Campaign.