Exotic Quest: A Dubious Task (Invective)

Follow these step-by-step to complete this quest:
 * 1) Complete 5 Strikes without dying
 * 2) Earn a K/D spread of 25 in Crucible - Deaths are -1 point
 * 3) Complete a weekly heroic strike
 * 4) Collect 50 special ammo synthesis and purchase a gun component from the gunsmith
 * 5) Return to Ikora to claim the Invective