Nope not really something you can do in the game unlike jackie who gets to show off with two pistols during missions. You're stuck using just one weapon at a time as v, same goes for melee stuff and cyber upgrades like mantis blades which technically count as dual but work as one weapon anyway. Official word from the devs confirmed they never put it in, though some fans tried making mods for it but those aren't official builds. Maybe interesting though - you can get pretty quick with weapon swaps using the number keys or triangle button and grab those quick draw perks, makes combat flow better when you're switching between your three equipped weapons.