Hello WHITESHADOW345. This quest step in the Iron Banner quest is bugged. Bungie has confirmed that Submachine Gun kills will progress this step of the quest. From [b][url=https://twitter.com/BungieHelp/status/1184217834965987328]Bungie Help tweet[/url][/b]: [quote]We’re investigating an issue where the Iron Banner “Scour the Rust” quest step, “Conviction,” says to land 10 Super final blows to earn progress, but also shows a Grenade Launcher icon. This step is actually progressed by earning 10 final blows with Submachine Guns.[/quote]