The Khvostov should be made into the base for an exotic gun bounty. It's such a cool auto rifle and is actually decently playable in PvP. Plus I think it has one of the most unique gun models in the game.
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I like the Idea, but if they do that then they'll need to make away so you can get it again if you don't have it or something. Example: The Gun Smith summons you and tell you that he heard of a cache of old world weapons (random planet maybe?) and asks you to look into it. Which gives you a bounty to start opening random chest you find while out on patrol or something. when you return to The Gun Smith with said cache, he give you the Khvostov as the reward.