The TacFire BU-300-16 Rifle Upper Assembly in 300 Blackout is a complete AR-platform upper designed for shooters who want a ready-to-run solution. Built around a 16" black nitride barrel with a threaded muzzle and A2-style flash hider, it pairs a forged 7075-T6 aluminum receiver with a long free-float M-LOK handguard and full-length Picatinny top rail for optics and accessories.

This upper comes fully assembled with bolt carrier group and charging handle, making it an easy upgrade for any mil-spec AR-15 lower. The 1:8 twist barrel and pistol-length gas system are tuned for both supersonic and subsonic .300 AAC Blackout loads, ideal for range use, hunting, and suppressed shooting. TacFire’s attention to machining, fit, and finish delivers a reliable, smooth-running upper that integrates cleanly into your existing rifle build.

• Manufacturer: TacFire
• Model: BU-300-16 Complete Upper Assembly
• Caliber: .300 AAC Blackout
• Barrel Length: 16"
• Barrel Twist Rate: 1:8
• Barrel Finish: Black Nitride
• Muzzle: 5/8x24 Threaded With A2-Style Flash Hider
• Receiver Material: 7075-T6 Forged Aluminum
• Receiver Finish: Black Anodized
• Handguard Type: Free-Float M-LOK Rail
• Gas System: Pistol Length With Low-Profile Gas Block
• Included Components: Bolt Carrier Group And Charging Handle