M4A1

Real Life
The M4 Carbine is one of the most popular military rifles in service today. It is a modified version of the M16 rifle that has a shorter length, adjustable stock, and special barrel for attaching an M203 grenade launcher. The M4A1 variant is fully automatic, and it sees service with many counter-terrorist forces worldwide.

Singleplayer
The M4A1 is the main weapon of CIA forces. It is rarely seen in the hands of Guardian soldiers in "". The M4A1 can be equipped with a Reflex Sight, Red-Dot Sight, ACOG scope, Holographic Sight, Foregrip, Fast Mag, and Laser Sight.

Multiplayer
The M4A1 has a unique firing sound for Multiplayer, and some gameplay trailers showed the weapon in action. Despite this, it was never added.