Rock River Arms AR1900 LAR-15M Assurance-C 5.56 NATO 16″

About this product

The Rock River Arms AR1900 LAR-15M Assurance-C is a semi-automatic carbine chambered in .223 Rem/5.56 NATO with a 16-inch CMV barrel and a carbine-length gas system. It ships with an RRA CAR lightweight quad-rail and a Picatinny rail gas block set at sight height for straightforward sighting options. Ergonomics include an RRA six-position Operator stock and a Hogue grip, while a two-stage match trigger provides a consistent, predictable pull. The package includes a 30+1 capacity magazine, an A2 flash hider, and a carrying case for transport and storage.

Key Specifications

• The rifle is chambered in .223 REM / 5.56 NATO.
• The barrel measures 16 inches and is CMV with a carbine-length gas system.
• The barrel is threaded to accept muzzle devices.
• The twist rate is 1:8 for stabilized projectiles within its chambering.
• The action is Semi-Auto.
• The magazine capacity is 30 + 1.
• The unloaded weight is approximately 7 lbs.
• The overall length is 33 inches.
• The muzzle device is an A2 Flash Hider.
• The stock is an RRA 6 Position Operator and the trigger is a Two Stage Match unit.

Built for dependable performance and modular adaptability, the AR1900 LAR-15M Assurance-C is well suited to range work, general-purpose shooting, and duty-style roles. Its lightweight quad-rail provides ample mounting options for optics and accessories, while the two-stage trigger and 1:8 twist barrel support consistent accuracy with commonly used projectiles in this chambering. This package delivers a balanced platform for shooters who value reliability, ergonomics, and straightforward serviceability.