GD-2

From Command and Conquer Wiki

The GD-2 is an automatic assault rifle with an integrated grenade launcher that was put into production after the Firestorm Crisis. It is cheap, reliable and fully customizable, allowing it to be employed by various soldiers, ranging from GDI Riflemen and spotters from sniper teams to Nod Militants, normally through the use of exchangeable barrels.

The basic weapon itself is a non-bullpup design, with a relatively short barrel, firing high caliber rounds. This made it an effective weapon on short and medium ranges but poor at long range. Given that most combat takes place on short ranges, this was deemed to be an acceptable trade-off. The integrated grenade launcher is breech loaded.