Dossier
The carbine is the baseline from which every other rifle decision in Leonida is made. VCPD carries it. The Leonida State Police carries it. The Leonida Cartel carries it. When every faction in a territory is running the same platform, the platform is reliable.
The modular configuration allows optics, suppressors, and grip accessories. In practice the configuration that shows up most often in Vice County is the standard iron sight setup because the engagement ranges in an urban environment do not require magnification.
For the protagonists it is the primary long arm. When Lucia or Jason needs to hold a position, cover a route, or engage beyond pistol range without committing to a heavier platform, this is what appears in the footage.