IJN Type 92 7.7 mm AA gun
On board of a kaichu Submarine
Gun view
Loadout view
Both the Type 92 13.2 mm and the Type 92 7.7 mm guns can be seen on this picture of the Jyunsen B sub.
same on the Type A1 submarine
model :Miner1436
textures and ingame implementation : Keltos