The M4A1 is an assault rifle used by the SWAT, the Terrorists, and Jake Hawkfield. It is one of the three weapons that has three firing modes, the others being the Glock and MP7. It also comes with a mid-ranged scope.
As of Chapter 1 this weapon was replaced with the Heckler & Koch G36K.
- Like the Sniper Rifle and Colt Python, this weapon does not share it's ammo pool with other weapons.
- In reality, the M4a1 should only have semi-automatic and automatic fire settings. The addition of burst fire, particular to the M4 (not to be confused with the M4a1), was a design choice likely made for the sake of gameplay, not authenticity.