Everyone doesn't use the dual wielding: The two weapon fighting is a lot easier in 5E, but if you choose it, you'll get the bonus action feature over the other options.Works well with thrown weapons: You must remember that you can replace it with another bonus if your throw firearms are lighter.That means it won't add it up to your Strength and Dexterity. In the context of the extra action, your first two punches will affect, which is caused because of 'Actual Action.' However, the additional move will not hit as hard as before. Moreover, the off-hand fight will have no pistols, so the only way to attack is punching.
But, you get this unique ability only once. They are lightweight, as in short pistols that don't damage more prominent contemporaries. As the name suggests, it's available to everyone.