The Bushmaster 0040017BLK QRC Complete Upper delivers a ready-to-run AR-15 top end built around a 16" 4150 CMV barrel with a durable black nitride finish and A2 birdcage flash hider. Its forged 7075-T6 A4 flat-top receiver and free-floating M-LOK handguard provide a rigid, lightweight platform with plenty of rail space for optics and accessories.

This complete upper is chambered in 5.56x45mm NATO / .223 Rem and uses a carbine-length gas system for dependable cycling across a wide range of loads. The included salt bath nitride bolt carrier group and MPI-tested bolt are engineered for long service life, making this assembly an excellent choice for range use, training, or building a dependable general-purpose AR-15. Bushmaster’s long-standing reputation for quality AR-pattern components is reflected in the fit, finish, and reliability of this QRC upper.

• Manufacturer: Bushmaster
• Model: QRC Complete Upper 0040017BLK
• Caliber: 5.56x45mm NATO / .223 Remington
• Barrel Length: 16"
• Barrel Material: 4150 Chrome Moly Vanadium Steel
• Barrel Finish: Black Nitride
• Twist: 1:7"