Well, if you are planning to make a whole game, then adding this is a simple task. Tutorials on adding new weapons is already there among other tutorials on my channel, just add left and right arm and left and right pistol separately, and when you run the firing logic use flip flop node to alternate. Also you will need a separate “ready to fire” variable. w.youtube.com/playlist?lis…BZjibaE5DCP4pp
There is also a video how I made the blender file for double pistols in the end. But you will have to add animations for it. Tutorials cover how to make animations in blender too. Basically if you go through the whole tutorial series, you will know how to make everything else.