We're probably going to be seeing more energy weapons, being in the Commonwealth and all
Sounds pretty expensive considering that energy weapons require either small energy cells or microfusion. Where would the materials come from to make more ammo for the energy cells, or knowledge to manufacture them. This is also a world where people can't even make new bottle caps.
It be kind of funny to see the technology lost and the people in the common wealth would have to have the guns be powered by long extension cords which in turn are powered by slaves on tread mills. Just imagine a bunch of dudes running down the street trying to defend their town only to find out someone forget to plug in their laser rifle.