After purchasing the Red Death from the Agent of the nine, I noticed in the description of the Exotic Pulse Rifle says that the "Vanguard urges you to destroy this weapon on sight, it is a Guardian Killer" I then proceeded with destroying this weapon and only found that it's like dismantling any other item. All I got back was 3 ascendant shards and a broken heart.
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There you see what you get for listening to them...insrtead you should have dismantled them with the Red Death