sentences:  It was used exclusively in fixed installations, i.e., either in fighters or in power-operated turrets.The Type 99 Mark 2 was carried by later models of the A6M, starting with the A6M3a Reisen Model 22 Ko, and on later Navy fighters such as the Kawanishi N1K-J.The Model 4 of this weapon adopted the same belt-feed mechanism as the Type 99 Mark 1 Model 4.