Built for precision and performance, this upper receiver assembly is chambered in .223 Wylde, making it compatible with both 5.56mm NATO and .223 Remington cartridges. It features a 20-inch air-gauged, heavy match-grade stainless steel barrel with a 1:8 twist, cryogenically treated for improved stability and longevity. The A2 flash hider sits atop 1/2x28 threads, while a gas block sight base handles gas system duties. A 12.5-inch RRA National Match CMP TRO aluminum free-float handguard offers excellent rigidity and heat resistance, and comes equipped with three 11.625-inch modular NM TRO rail sections for accessory mounting. This complete upper includes a forged A4 upper receiver, as well as a bolt carrier group and charging handle assembly, making it ready to pair with your favorite lower.