Rock River Arms 5.56 NATO 16" 31-Round AR Rifle

The Rock River Arms AR1900 LAR-15M Assurance-C Carbine in 5.56x45mm NATO represents a purpose-built platform for patrol, training, and duty applications requiring a compact, modular rifle system. Chambered in 5.56 NATO with a 16-inch carbine-length gas system barrel, this rifle delivers the velocity and reliability demanded in professional law enforcement and military training environments while maintaining the ergonomic footprint necessary for vehicle operations and building clearance scenarios.

The Assurance-C features a cold-hammer-forged (CMV) barrel paired with a carbine-length gas tube, a configuration optimized for rapid target engagement and sustained accuracy across typical engagement ranges. The integrated Picatinny rail gas block is mounted at optimal height for co-witness sight operation, whether using backup iron sights or electronic optics. The RRA CAR lightweight quad-rail platform provides four continuous Picatinny surfaces for mounting lights, lasers, or accessories without rail adapter clutter. Included in this package are the RRA Operator stock for length-of-pull adjustment and the Hogue grip for ergonomic control and reduced hand fatigue during extended use. The 30+1 capacity (5.56 NATO standard) ensures sufficient firepower for duty scenarios, and the included carrying case protects your investment during transport and storage.

This configuration is purpose-designed for patrol officers, tactical instructors, reserve and auxiliary units, and serious civilian shooters seeking a dependable 5.56 NATO carbine for training and service. The carbine length gas system mitigates recoil impulse compared to rifle-length systems while maintaining reliability across a broad range of ammunition, reducing shooter fatigue during qualification and advanced courses. The modular rail system allows rapid reconfiguration to match evolving mission requirements without gunsmith intervention.

At 16.55 lbs fully assembled, the LAR-15M Assurance-C sits within the standard operating weight range for duty carbines, balancing controllability with the mass needed for recoil management and durability under sustained fire. The black finish provides the aesthetic consistency expected in professional environments while offering baseline corrosion resistance for outdoor and varied-weather deployment.