Nope, those habilities are unique to "looted" weapons and iconic
(like 2 bullets per shot on Widow Maker and Lizzie).
For power weapon, if you have "cancels horizontal recoil" by the abilitiy and "cancels vertical recoil" by a mod. It's pretty damn stable weapon.
No need to talk about a Quasar with 2 bullets per shot (it's just devastating).
But if you can "choose" the color, it could be nice early game when you can't obtain legendary in container (before level 34+)
I've only seen these in games. I don't know where else they can be found. Recently read about gun control, used
https://studydriver.com/gun-control/ for that. There I read that one businessman had a golden pistol. I honestly don't understand why he should. Here you can explain everything only with punts.