Karabijn:geweer kort model 99, 1939; P.190: Model 99 (1939) 7.7-mm rifle. 1). General description. The Japanese are replacing their 6.5-mm weapons with this shorter, heavier caliber weapon (fig. 173). This rifle is an improved version of model 38 (1905) Arisaka rifle. The rifle has a blade front sight and a leaf rear sight graduated from ...