How to unlock: Talk to Arlen Glass in The Slog (M2,5)
Arlen Glass will ask you to bring him parts needed for repairing the toys from the factory. If you have Charisma, you can bargain the price.
Go to where he pointed you, to the Wilson Atomatyoys Factory. The location is quite uncovered, so it is a good idea to use the sniper rifle. The place is occupied by few supermutants, which means it won't be easy. One of them has a minigun, another one is equipped with laser musket. Remember where the bodies are lying - soon you will have to search them.
If you manage to beat them - or if you try to sneak up - walk to the ground floor where the mission marker is pointing you. There you will find door opened with access card. If you received the card from the questgiver, you can enter and collect the items you seek from the chest. Otherwise, first you must search the bodies of killed enemies. One of them will have the card.
Quest reward: experience, 150 bottlecaps (you can increase it with Charisma by: 75, 75 + ID card that gives you access to the building-objective)