It's not a missing weapon the code gave you the grimoire card red death was available like that too or maybe it was another gun I forget. Either way it was for the grimoire card only you still need to earn your gun.
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Please read full post, and earn is much different than RNG, either way got it eventually
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[quote]Destiny tracker clearly states some kills recorded are from people near you that used that weapon[/quote]
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Nah It was a code for the grimiore card I had it as well.