Added the once-popular XM8 gun family. Including the standard type, CQB type, precision marksman rifle type and light machine gun type.
The CQB type, the standard version and the light machine gun type are suitable for combat from near to far, using 5.56nato shells. The Precision Marksman rifle version uses 7.62 NATO rounds.
The properties of these guns are slightly stronger than the original corresponding guns, and the cost is balanced.
The M320 Grenade Launcher has been added, which can be used alone or retrofitted to the XM8 Standard and Precision Marksman Rifle models.
