Weapon tags:
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At the main menu, select "Help + Options", and choose the "Unlock Code"
selection. Then, enter one of the following case-sensitive codes to
activate the corresponding weapon tag to use through the "Armory Weapon
Customization" option. If you entered the code correctly, you will hear
a bell followed by a woman screaming.

Result Code
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Alienware black dog tags Alienwarec8pestU
Alienware symbol Al13nwa4re5acasE
AMD VISION square tag (blue) 4MDB4quprex
AMD VISION square tag (red) AMD3afrUnap
ATi square tag AT1hAqup7Su
Blacklight and crossed swords R41nB0wu7p3
Blacklight logo chip Ch1pBLuS9PR
E3 dog tags E3F6crAS5u
Famitsu Magazine dog tag Fam1tsuprusWe2e
Jace Hall Show logo J4ceH4llstuFaCh4
Orange Scorpion logo chip Ch1pMMRSc0rp
Order logo chip Ch1p0RD3Ru02
Pink brass knuckles H4rtBr34kerio4u
Razer logo R4z3erzu8habuC
Upper Playground logo UPGr0undv2FUDame
Upper Playground logo UPGr0undWupraf4u
UTV Lightning logo chip Ch1p1GN1u0S
Yellow teddy bear Denek1Ju3aceH7
Zombie Studios logo chip Ch1pZ0MB1Et7
Australian flag AUS9eT5edru
Austrian flag AUTF6crAS5u
Belgium flag BELS7utHAsP
Canadian flag CANfeprUtr5
Danish flag DENdathe8HU
Finnish flag FINw3uthEfe
French flag FRApRUyUT4a
German flag GERtRE4a4eS
Hong Kong flag HOKYeQuKuw3
Indian flag INDs4u8RApr
Irish flag IRE8ruGejec
Italian flag ITAQ7Swu9re
Japanese flag JPNj7fazebR
Korean flag KORpaphA9uK
Mexican flag MEX5Usw2YAd
New Zealand flag NZLxut32eSA
Norwegian flag NOR3Waga8wa
Portuguese flag PORQ54aFrEY
Russian flag RUS7rusteXe
Singaporean flag SINvuS8E2aC
Swedish flag SWEt2aPHutr
Swiss flag SWIsTE8tafU
Taiwanese flag TAW8udukUP2
United Kingdom flag UKv4D3phed
United States flag USAM3spudre