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.
Specs at a glance
Key attributes
| upc | 842834100880 |
| manufacturer | Rock River Arms |
| manufacturer part number | AR1900 |
| action | Semi-Auto |
| barrel length | 16" |
| caliber/gauge | .223 REM/5.56 NATO |
| capacity | 30 + 1 |
| safety | Selector Switch |