You can get Pinnacle Gear from these sources: - GoS Raid - 100k Nightfall: The Ordeal - 980 Power Nightmare Hunt - Pit of Heresy Dungeon (only Boss drop but guaranteed armor) - Sundial Legend You can get a guaranteed Pinnacle Armor drop from the dungeon and a guaranteed weapon from the Sundial (and choose the slot), but apart from that, it's random if you receive a weapon or armor pieces.