Description
The TacFire BU-556-16 Complete Upper Assembly in 5.56x45mm NATO provides a ready-to-install solution for building or upgrading an AR-15 rifle with reliable performance for training, competition, and defensive applications. This complete upper features a 16 inch Black Nitride barrel, 7075-T6 aluminum receiver, 15 inch M-LOK free float handguard, and includes a bolt carrier group for shooters seeking versatile capability with standard AR-15 magazines and components.
Key Features
Manufacturer Part Number: BU-556-16
Caliber: 5.56x45mm NATO, also accepts .223 Remington
Barrel Length: 16 inches, 4150 Chrome Moly Vanadium steel with Black Nitride finish
Barrel Twist Rate: 1:8
Barrel Thread: 1/2×28 with A2 style flash hider
Gas System: Carbine length with low profile gas block
Upper Receiver: 7075-T6 forged aluminum with Black Anodized finish
Handguard: 15 inch M-LOK free float rail with Black Anodized finish
Bolt Carrier Group: Included
Charging Handle: Included
Forward Assist: Installed
Ejection Port Cover: Installed
UPC: 686294505850
Special Features
Complete upper assembly includes all components needed except lower receiver for immediate installation
Black Nitride barrel finish provides superior corrosion resistance and reduced friction compared to phosphate coatings
M-LOK handguard accepts direct mount accessories without bulky rail sections for weight savings and ergonomics
Free float handguard design eliminates contact with barrel for improved accuracy potential
1:8 twist rate stabilizes bullets from 55 grain to 77 grain across full ammunition range
Carbine length gas system provides reliable cycling with standard and defensive ammunition
1/2×28 threading accepts most 5.56 suppressors and muzzle devices without adapters
Forged 7075-T6 aluminum receiver provides mil-spec strength and accepts all standard AR-15 components
Low profile gas block fits under free float handguard for clean appearance and snag-free operation
Full length Picatinny top rail accommodates any optic from red dots to magnified scopes
Practical Benefits
5.56 NATO chambering accepts both military specification 5.56 and commercial .223 Remington ammunition for maximum versatility
16 inch barrel meets legal rifle length requirements while providing optimal velocity for 55 to 77 grain bullets
Included bolt carrier group eliminates need to source separate components for complete build
M-LOK mounting system allows attachment of lights, grips, and bipods at preferred positions for competition or tactical use
Free float design improves accuracy for precision shooting at 100 to 300 yards on targets or game
Carbine length gas system ensures reliable function with wide range of commercial and military ammunition
Black Nitride finish resists corrosion during field use in wet conditions or storage without frequent maintenance
1:8 twist stabilizes everything from 55 grain bulk ammunition to 77 grain match projectiles
Drop-in installation onto any mil-spec AR-15 lower receiver takes minutes with standard tools
A2 flash hider controls muzzle flash and can be easily replaced with suppressor or compensator
The TacFire BU-556-16 Complete Upper Assembly 5.56x45mm NATO is a solid fit for shooters building a versatile AR-15 platform capable of training, competition, hunting, and defensive applications.
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