This is a LWRC AR known as the IC-A5 chambered in 223 Remington, model ICA5R5CK16.
Directly descended from the rifles developed by LWRCI(TM) to meet the requirements for the U.S. Army Individual Carbine program" the IC-A5 is built for high performance.
Features:
2 Position Adjustable Gas Block
Patented Short-Stroke Gas-Piston System
Cold Hammer Forged Barrel
Ambidextrous Lower