The Aim Sports AR5CUB3 Complete Upper Assembly 5.56x45mm NATO brings a ready-to-install AR-15 upper built around a 16" SOCOM profile barrel and a slim 15" M-LOK free-float handguard. The forged 7075-T6 aluminum upper receiver wears a durable black hard coat anodized finish, while the 4150 chrome moly vanadium barrel uses a salt bath nitride treatment, M4 feed ramps, and an A2 flash hider for dependable performance.

This complete upper includes a mid-length gas system with a low profile gas block and ships with a full-auto, MPI-tested bolt carrier group and charging handle, giving builders a straightforward path to a reliable 5.56 NATO AR-15. The extended M-LOK handguard offers generous space for lights, grips, and other accessories, making this assembly well suited for range use, training, and general-purpose shooting. Aim Sports’ focus on practical design and solid machining is evident throughout this upper, providing a balanced blend of durability and value.

Key Features:

• Manufacturer: Aim Sports
• Model: AR5CUB3 Complete Upper Assembly
• Caliber: 5.56x45mm NATO
• Barrel Length: 16" SOCOM profile
• Barrel Material: 4150 Chrome Moly Vanadium Steel
• Barrel Finish: Salt Bath Nitride
• Handguard: 15" M-LOK Free-Float
• Receiver Material: Forged 7075-T6 Aluminum
• Receiver Finish: Black Hard Coat Anodized
• Gas System: Mid-Length with Low Profile Gas Block
• Included Components: Upper Receiver, Charging Handle, Full Auto BCG
• Feed Ramps: M4 Feed Ramps
• Muzzle Device: A2 Flash Hider