You find all the pieces of N7 armor automatically. You can complete following armor sets during your Mass Effect 3 adventures:
If you are looking for weapons, read our Weapons Locations Guide. Read our Mass Effect 3 Armor Locations for detailed guide on where to find these armor pieces to complete your armor. Wearing a good armor increases your survival rate against your enemies in pursuit of War Assets, but if you want to look good wearing an armor, you will have to complete an armor set for which we prepared this Mass Effect 3 Armor Sets guide.
