Mine didn't come with firefly. it came with unflinching and return round to mag for precision kill if I recall. I could be wrong as I have gotten many of them now.
Now year one I used Praedyth's Revenge which has similar base stats as 1YS and was just as effective in PvP/PvE. It had firefly and it actualy netted me many extra and or easy kills.
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The reward 1K Yard Stare came with Firefly after completing The Taken War Earth. Unless i'm mistaken and there is a second 1K Yard Stare reward in the game? I have one with Unflinching too, but that came from a Blue engram.
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Your probably right as its been a while since I got mine and I have received like 5 or 6 of them in my casual play time. But they drop so often and the quest that they are anything but rare.