Map Name = Keypad Code
Keypads
Gator Zone = 264
Widow Mine = 105
Eden = 867
The Sky Whale = 666
Happy Hills = 720
Spendthrift Ruins = 518
The Editor Archive = 681
DRC = 245
Skeleton Road = 658
Hydro Generator = 476
Oasis = 723
The Dying Place = 315
Map Name Containing Each Weapon Part
Weapon parts - blue open signs
Proving Grounds
DRC
Club 14
Oasis
New Karnak
Source: https://steamcommunity.com/sharedfiles/filedetails/?id=2981861175