With Bungie you never know if it's actually a key to a Easter egg.
The Stranger hands it to you. This could be Bungie's way of saying this is important for other things.
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I kept 1 just because I thought it'd be cool to have and it's one-of-a-kind. I did the same with the Khvostov (sp?) because I thought the broken viewfinder was unique. All the other low-level weapons can eat it, though.