Call of Duty Modern Warfare 3: M4 Attachments
Assault rifle – The flagship rifle of the M4 platform. This reliable workhorse is a jack-of-all-trades that performs well in most combat scenarios.
| Level | Unlock | Type |
| 2 | SZ Lonewolf – optic | Universal attachment |
| 3 | Echoline GS-X – muzzle | Universal attachment |
| 4 | 11.5” T-H4 Barrel – barrel | M4 platform attachment |
| 5 | 45 Round Mag – magazine | M4 platform attachment |
| 6 | FSS Sharkfin 90 – underbarrel | Universal attachment |
| 7 | Corio Precio Factory – stock§ | M4 platform attachment |
| 8 | Sakin ZX – rear grip | M4 platform attachment |
| 9 | 5.56 Armor Piercing – ammunition | Universal attachment |
| 10 | Tempus Trench Pro – barrel | M4 platform attachment |
| 11 | Tempus P80 Strike – stock | M4 platform attachment |
| 12 | 1MW Laser Box – laser | Universal attachment |
| 13 | FTAC Recon – receiver | New weapon |
| 14 | Demo D50 Buffer Tube – stock | M4 platform attachment |
| 15 | Hightower 20” Barrel – barrel | M4 platform attachment |
| 16 | Xten Grip – rear grip | M4 platform attachment |
| 17 | 60 Round Mag – magazine | M4 platform attachment |
| 18 | 556 Icarus – reciever | New weapon |
| 19 | Demo Fade Pro – stock | M4 platform attachment |
| 20 | Weapon tuning | Fine-tune attachment performance on this weapon |