HCR 56 Unlock Level
| Weapon | Rank Unlocked | Weapon Type |
| HCR 56 | Unlocked at STB 556 Level 20 | LMG |
Bruen Bullpup Weapon Platform Unlock Level
There are 3 different weapons that players can unlock in the Bruen Bullpup Weapon Platform.
| Weapon | Rank Unlocked | Weapon Type |
| STB 556 | Unlocked at Rank 41 | Assault Rifle |
| MX9 | Unlocked at STB 556 Level 13 | SMG |
| HCR 56 | Unlocked at STB 556 Level 20 | LMG |
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MW3 Weapon Unlock Levels