Hellraiser
Arcane
The RR BB gun - that's a joke, right? It isn't looking very futuristic at all, retro or not.
I was listing the only weapons in Fallout 1 or 2 that I recalled and thought also looked/were "retro 50s" rather than going for the contemporary futuristic look. You can argue this is a stretch, but if I was doing something retro-futuristic in this area, I would put a bunch of real world "battle-proven" guns from the 1950s into the item pool in addition to the 50s futurism ones, to establish that the "divergence point" was the 50s. Feel free to disagree, in the end this is really just a subjective vision or manifestation of my own creative style speaking here rather than encyclopedic definition of what is retro-futurism based on some decade.
As for the plasma rifle again feel free to disagree, but for me the weird science fiction look leans into 50s pulp magazine/comic book cover turf.
Is this "Fallout 1 did everything better than Fallout 2" talking here?
No, that was not the point, I forgot to put "IMO also the" in front of my post to indicate I agree the FO2 pulse weapons are retro and I guess this mislead you, could have sworn I had that in that post when I was writing it at some point.
FYI I mentioned those are all FO1 was because that's definitely the original vision and that it wasn't fully contemporary futurism, rather than something one could pin on the change of teams between FO1 and FO2 leading to possible claims that Boyarsky and the rest meant "contemporary futursim only" for Fallout guns.