I have already told you what you need to do last week. So please stop posting on the same subject. The step you are on is a 3 step you have completed 2. The 3 steps are as follows. You need to do all 3 to complete that part of the quest. 1. Complete encounters at the Blind Well, at any of the Black Armory forges, or in Escalation Protocol you need 35 points to complete. 2. Complete a Nightfall strike with a score of 50,000 or higher. 3. After that, you must complete the Fireteam Leader step, which involves completing any activity with the Rose hand cannon equipped. Having others in your party makes this goes quicker.