Weapon Upgrade stations can be found at the following locations.

1. Ryan Amusements: Going to get the ticket.
2. Ryan Amusements: After the family display, through the door.
3. Pauper's Drop: From Journal 039, go out the door, down the stairs.
4. Pauper's Drop: In the back of skid row, in the limbo room. It will be behind the stage
5. Pauper's Drop: After breaking into hotel, when you are going through the halls, you will go through a hole. To your left you will see a blue sheet. To the right is the station.
6. Siren Alley: In Mermaid Lounge, go upstairs hack the gate. Drop through a hole in the floor.
7. Siren Alley: Just before Pump station 5.
8. Dionysus Park: Behind the door, combination 1080.
9. Dionysus Park: On the path to the train.
10. Fontaine Futuristics: After you destroy the flying Gil bot, you can enter where you get access to laboratory.
11. Fontaine Futuristics: After you turn on the lights, it will be in the bottom of the holding cells area.
12. Persephone Outer: On your left.
13. Inner Persephone: After you gain access to Sinclair look back in the room.
14. Inner Persephone: Just after ward B in the room with the rocket turret.