Car-15

"First used exculsively in veitnam, CAR-15 soon become the standard assault rifle for U.S Army. It is lightweight fully automatic and more maneuverable than m16, making it preferred assault rifle for Delta Force. The only downside is that the shorter barrel reduces accuracy."

Offical discription

Overview
CAR-15 is a automatic rifle featured in Delta force Black hawk down. It also has a grenade launcher variant. It has a usable acog and has 30 round mag. It is useful in close to medium ranged combat, However it will get inaccurate at long ranges. It has a automatic and semi-automatic firing modes. It is used by Delta force Rangers and 10th mountain soldiers.