The key is 5 = Sleeper Simulant
5 Rasputin emblems on barrel
5 ricochet bullets
5 scannable places in Promethean code
5 relics
Gunsmith rank 5!
Here's a pic didn't anyone look at the description it is similar to dark age relics
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Rank 5 doesn't trigger anything. https://www.reddit.com/r/DestinyTheGame/comments/3mydoo/rank_5_gunsmith_does_not_trigger_the_sleeper/ only 4 of the Fusion Rifle relics exist in the database https://www.reddit.com/r/SearchfortheSleeper/comments/3mhq63/sleeper_simulant_theory_megathread/