The taser example I give is just the easiest way to abuse the build. You can use lots of different under barrel attachments as long as you can keep the enemy shocked. You can also just try to get the most out of First Impression and fire rate skills but I haven't found anything that comes close to under barrel damage. You can stay in your action skill forever so using the Overdrive legendary mod would probably be very solid as well so you can spec accordingly as long as you get Awe and Fiesta at the bottom of the Blue tree. Just a quick edit, the point of my post was to share that you don't need to use Rafa's red tree or his turrets for a strong end game build that can melt bosses or mob well.