Rock River Arms LAR-15M Assurance-M Carbine 5.56 NATO 16" 31-Round Carbine

The Rock River Arms LAR-15M Assurance-M Carbine 5.56 NATO 16" is a purpose-built platform for law enforcement, military, and civilian operators who demand reliable performance in dynamic environments. This mid-length gas-system carbine bridges the gap between full-size rifles and compact PDWs, delivering the ballistic capability of 5.56 NATO in a maneuverable 40-inch overall length. Purpose-designed for rapid target engagement and high-volume training cycles, the Assurance-M combines Rock River's proven manufacturing standards with field-tested ergonomics.

Built on a fully assembled forged aluminum receiver set with tight tolerances, the LAR-15M features a mid-length gas tube and chrome-lined barrel for extended service life and corrosion resistance in harsh conditions. The 16-inch barrel provides velocity adequate for effective terminal performance while reducing muzzle blast and recoil impulse compared to longer configurations. At 16.05 pounds, the carbine's balanced weight distribution—optimized for repeated movement drills and sustained fire—makes it controllable for shooters of varying stature and strength levels. The 31-round magazine capacity ensures extended engagement duration without frequent reloads, critical in threat scenarios requiring sustained suppressive fire or multiple target engagement.

This platform serves tactical teams, agency armories, and home-defense-oriented civilians seeking a tested AR-pattern rifle without custom build complexity. The Assurance-M's mid-length setup reduces carrier tilt and bolt wear compared to carbine-length gas systems, extending component service intervals—a measurable advantage in agencies running high-round-count qualification schedules. Rock River's factory assembly ensures consistent trigger break geometry and barrel harmonics from rifle to rifle, simplifying qualification standards across teams. Drop-in compatibility with standard AR-15 upper and lower receiver accessories means optics, lights, slings, and rail systems integrate without gunsmithing, enabling rapid reconfiguration for mission requirements.