So you know for next time, when you swap while gunzerking the guns go default, so slots 1 and 3 will be in your right hand and slots 2 and 4 will be in your left. Also, if you leave a slot empty, that hand doesnt swap, so with Sal's usual pistol build you keep a DPUH in slot 1 with a grog in 2, skip 3 and Lady fist in 4, so when you swap, its only the grog and LF being changed. Hopefully this helps and i explained it well enough.
