TacFire BU-556-16 Rifle Upper Assembly — 5.56x45mm NATO, 16" Black Nitride Barrel, 7075-T6 Black Anodized Receiver, Free-Float M-LOK Handguard | AR-Platform | Model BU55616 (UPC: 686294505850)
Level up your AR-15 build with the TacFire BU-556-16 Rifle Upper Assembly—a balanced, duty-ready configuration built around a 16-inch black nitride barrel, a forged 7075-T6 aluminum upper receiver with a black anodized finish, and a lightweight free-float M-LOK handguard. This model includes a complete bolt carrier group (BCG) so you can pair it with a compatible lower, add a charging handle and sights, and hit the range (where lawful) with minimal fuss.
Why Builders Choose the BU-556-16
Out-of-the-box readiness: Ships with a complete BCG for simplified assembly and reliable function.
Proven barrel treatment: Black nitride enhances surface hardness, corrosion resistance, and cleaning ease—excellent for high-round-count training.
Strength where it matters: 7075-T6 forged aluminum receiver delivers superior tensile strength compared to common 6061 uppers.
Accuracy-minded handguard: Free-float M-LOK rail reduces external pressure on the barrel and offers flexible accessory placement.
Optics-ready top: Flat-top Picatinny receiver rail integrates red dots, prisms, LPVOs, and iron sights with straightforward mounting.
Mil-pattern compatibility: Designed to mate with standard AR-15 lowers, charging handles, and accessories for easy upgrades.
Key Features at a Glance
Caliber: 5.56x45mm NATO (.223 Rem-compatible in typical 5.56 chambers; follow manufacturer guidance)
Barrel Length: 16 inches (rifle-length legal standard in many jurisdictions)
Barrel Finish/Treatment: Black nitride
Receiver: 7075-T6 aluminum, black anodized, flat-top Picatinny
Handguard: Free-float M-LOK, slim profile for comfortable control
Included: Bolt Carrier Group (BCG)
Model: BU55616
UPC: 686294505850
Color: Black
Note: Charging handle, muzzle device, and sights/optics may be sold separately depending on the retailer. Verify the “what’s included” list prior to purchase.
Performance Details That Matter
Balanced 16" Profile: The sweet spot for velocity, handling, and accessory compatibility—great for general-purpose carbines.
Free-Float Consistency: Isolating the handguard from the barrel can support repeatable point of impact, especially with lights, bipods, or grips attached.
M-LOK Versatility: Attach lights, handstops, foregrips, QD sling mounts, and more exactly where you want them for ergonomics that fit your shooting style.
Receivers That Fit Right: Forged 7075-T6 geometry supports secure barrel seating and alignment with your handguard for a clean, professional build.
Ideal Use Cases
All-Purpose Carbine Builds: Training, range days, and skills development.
Home Range / Ranch Carbines: Dependable, optics-ready setup with modern mounting real estate.
Class & Course Guns: Nitride barrel and free-float rail suit high-volume practice and accessory experimentation.
Upgrade Paths: Start with a clean foundation and expand with muzzle devices, BUIS, and optics to taste.
What’s Included / What You’ll Need
Included:
Commonly Purchased Separately:
Charging handle (standard AR-15 pattern)
Muzzle device (flash hider, brake, or compensator; verify thread and timing needs)
Sights/Optic (BUIS, red dot, prism, or LPVO)
Compatible AR-15 lower (configured per local laws)
Magazines & ammunition (5.56/.223 appropriate)
Specifications
Platform: AR-15 / AR-Platform Rifle Upper
Caliber: 5.56x45mm NATO
Barrel: 16" steel, black nitride treated
Receiver: 7075-T6 forged aluminum, black anodized
Handguard: Free-float M-LOK with continuous-top alignment to receiver
Rail: Flat-top Picatinny (receiver)
Includes BCG: Yes
Model #: BU55616
UPC: 686294505850
Finish/Color: Black
Frequently Asked Questions
Q: Can I shoot .223 Remington with this upper?
A: Most 5.56 NATO chambers accept .223 Remington, but always follow manufacturer guidance and ensure proper headspace and maintenance.
Q: Is the charging handle included?
A: Many packages do not include a charging handle. A standard AR-15 pattern charging handle is typically compatible—check your retailer’s “in the box” list.
Q: What gas system length is used?
A: Configuration can vary by batch. Most 16" uppers are set up with mid-length or carbine-length systems; verify specifics with the seller if this is critical to your build.
Q: Will the M-LOK handguard accept my accessories?
A: Yes. M-LOK is a widely adopted standard and supports a broad range of direct-mount accessories.
Compliance, Safety & Legal
Know the law: Barrel length, overall length, and feature rules differ by jurisdiction. Ensure your build complies with all federal, state, and local regulations.
Assemble responsibly: Follow torque specs, use quality tools, verify headspace, and conduct a proper function check before live fire. When in doubt, consult a qualified armorer.
Range etiquette & maintenance: Use quality ammunition, adhere to range SOPs, and maintain your rifle for consistent performance.
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Upgrade your AR-15 with the TacFire BU-556-16 Rifle Upper Assembly—a reliable, optics-ready package featuring a 16" black-nitride barrel, 7075-T6 black-anodized receiver, free-float M-LOK handguard, and included BCG for a clean, confidence-inspiring build.
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