The TacFire BU-556-16 Rifle Upper Assembly brings together a 16" black nitride 5.56x45mm NATO barrel, forged 7075-T6 aluminum receiver, and a sleek M-LOK free float handguard to create a ready-to-install AR-platform upper. This complete assembly includes a bolt carrier group, A2 flash hider, and full-length Picatinny top rail, giving builders a clean, modern package that mounts directly to any mil-spec AR-15 lower.

Designed for shooters who want a dependable upper without piecing together individual components, the BU-556-16 offers a versatile 1:8 twist barrel that handles common .223 Remington and 5.56 NATO loads. The free float M-LOK handguard keeps weight down while providing ample space for lights, grips, and other accessories, making this upper well suited for range use, training, and general-purpose rifle builds. TacFire’s focus on practical design and solid machining is evident throughout this assembly, delivering a straightforward upgrade backed by a reputation for value-driven innovation.

• Manufacturer: TacFire
• Model: BU-556-16 Rifle Upper Assembly
• Caliber: 5.56x45mm NATO / .223 Remington
• Barrel Length: 16"
• Barrel Finish: Black Nitride
• Barrel Twist Rate: 1:8
• Muzzle: A2 Flash Hider, 1/2x28 Threaded
• Receiver Material: 7075-T6 Aluminum
• Receiver Finish: Black Anodized
• Handguard: 15" M-LOK Free Float Rail
• Type: Complete Upper Assembly With Bolt Carrier Group
• Firearm Fit: AR-Platform