Me thinks you answered your own question in the first few sentances of your own link...
"The Howa Type 89 Assault Rifle (89式アサルトライフル, hachi-kyū-shiki-asaruto-raifuru?), referred to as the "type89 5.56mm rifle" (89式5.56mm小銃, hachi-kyūshiki-go-ten-go-roku-miri-syōjū?),[5][6] is a Japanese assault rifle used by the Japan Self-Defense Forces,[6] the Japan Coast Guard's Special Security Team units,[6] and the Special Assault Team. It was never exported outside of Japan due to its strict anti-hardware export policy. It is known in J.G.S.D.F service as Buddy.[6][7]"