The Aim Sports AR5CUB8 Assembly 5.56x45mm NATO Complete Upper brings together a forged 7075-T6 aluminum receiver, a 10.50" 4150 chrome moly vanadium barrel with black nitride finish, and a 10" M-LOK free-float handguard into a ready-to-run AR-15 upper. The upper includes a nitride bolt carrier group, standard charging handle, and A2 flash hider, giving builders a straightforward path to a reliable AR-15 pistol or short-barreled rifle configuration.

This upper is chambered for 5.56x45mm NATO with a 1:8" twist to stabilize a wide range of bullet weights, and uses a carbine-length gas system with low-profile gas block for smooth cycling. The optic-ready top rail and M-LOK handguard make it easy to mount lights, grips, and optics for range work, training, or general-purpose use. Aim Sports’ focus on solid materials, nitride-treated components, and mil-spec construction results in an upper assembly that offers dependable performance and straightforward compatibility with standard AR-15 lowers.

Key Features:

• Manufacturer: Aim Sports
• Model: AR5CUB8
• Caliber: 5.56x45mm NATO / .223 Remington
• Condition: New
• Barrel Length: 10.5"
• Threaded Barrel: Yes, 1/2x28 with A2 flash hider
• What's In The Box: Complete upper receiver with bolt carrier group and charging handle
• Weight: 3.85 lbs (upper assembly)