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Other than that you either accidentally console command summoned it, or if you have a mod(s) maybe one of them randomly spawned it (rare but it can happen).
Unique guns can only be bought, looted, picked up, or killing people then looting it from their dead corpses. Also dome quests give you unique weapons too.
They dom't randomly spawn or can be randomly found in lootable places (unless, again, you have a mod or mods that can randomly spawn the unique items).
I had know idea, but i do remember going to the Bison Steve, unlocking everything, and just pressing a when i got to the safe.