TacFire BU-556-10 Pistol Upper Assembly — 5.56x45mm NATO, 10" Black Nitride Barrel, 7075-T6 Black Anodized Receiver, M-LOK Handguard | AR-Platform | Model BU55610 (UPC: 729205518300)
Build your AR-pattern pistol with confidence. The TacFire BU-556-10 Pistol Upper Assembly pairs a 10-inch 5.56x45mm NATO barrel (black nitride) with a forged 7075-T6 aluminum upper receiver and a sleek free-float M-LOK handguard. Purpose-built for reliability, this complete upper arrives ready to run with a bolt carrier group—so you can pin it to a compatible AR-15 lower, add your preferred muzzle device and sights, and head to the range (where lawful).
Why Choose the TacFire BU-556-10?
Ready out of the box: Includes complete BCG (bolt, carrier, gas key, and firing pin installed) for a true plug-and-play upper assembly.
Tough barrel finish: Black nitride treatment increases surface hardness and corrosion resistance for long service life and easy cleaning.
Lightweight strength: 7075-T6 forged aluminum receiver offers superior tensile strength and durability over 6061 alternatives.
Enhanced handling: Free-float M-LOK handguard keeps weight forward of the receiver low and lets your barrel vibrate naturally for consistent accuracy potential.
Optics-ready: Flat-top Picatinny rail on the receiver integrates red dots, prisms, or irons with minimal fuss.
Mil-pattern compatibility: Designed to mate with standard AR-15 lowers, charging handles, and accessories for a painless upgrade path.
Key Features at a Glance
Caliber: 5.56x45mm NATO (.223 Rem compatible when properly chambered and headspaced)
Barrel Length: 10 inches
Barrel Finish: Black nitride
Receiver: 7075-T6 aluminum, black anodized, flat-top Picatinny
Handguard: Free-float M-LOK (slim profile for comfortable control)
Type: AR-Platform pistol upper assembly
Includes: Bolt Carrier Group (BCG)
Model: BU55610
UPC: 729205518300
Color: Black
Note: Muzzle device, charging handle, sights/optics, and lower receiver components may be sold separately depending on the retailer. Always verify the “what’s included” list before purchase.
Performance-Forward Details
Black Nitride Barrel: Known for smooth fouling release and excellent wear resistance—ideal for frequent training or classes.
Free-Float Rail: By isolating the handguard from the barrel, you reduce external pressure on the barrel, helping maintain POI consistency.
Tunable Accessory Layout: M-LOK slots let you position lights, grips, and sling points exactly where you want them for better ergonomics.
Solid Receiver Geometry: Consistent dimensions support reliable barrel seating and proper alignment with your handguard, aiding long-term repeatability.
Ideal Uses
Training & Range Days: Reliable, optics-ready upper for general practice.
Home Range/Truck Pistol Builds: Compact 10" length supports maneuverability (where lawful).
PCC/Carbine Transition Drills: Match your manual of arms to your existing AR-15 for seamless reps.
Customization Platforms: Add suppressor-ready muzzle devices, backup irons, or LPVOs to suit your goals.
What’s Included / What You’ll Need
Included:
You may still need (commonly purchased separately):
Charging handle
Muzzle device (flash hider, comp, or brake)
Sights or optics
Complete, compatible AR-15 lower receiver (pistol-configured where applicable)
Magazines and ammo (5.56/.223 as appropriate)
Compatibility & Fit
Designed for AR-15 pattern lowers (pistol configuration where required by law).
Standard .250" takedown/pivot pin spec.
Works with most mil-pattern charging handles, BCGs (BCG included), and buffer systems configured for AR-pistol use.
Specifications
Platform: AR-Pattern Pistol Upper
Caliber: 5.56x45mm NATO
Barrel: 10" steel, black nitride treated
Receiver: 7075-T6 forged aluminum, black anodized
Handguard: Free-float M-LOK, continuous top rail alignment with receiver
Rail: Flat-top Picatinny (receiver)
Includes BCG: Yes
Model #: BU55610
UPC: 729205518300
Finish/Color: Black
Frequently Asked Questions
Q: Is a charging handle included?
A: Many packages exclude the charging handle; check your retailer’s “in the box” list to confirm. A standard AR-15 charging handle is typically compatible.
Q: Can I shoot .223 Remington with this upper?
A: Yes—5.56 NATO chambers accept .223 Rem in most AR-15 setups when correctly headspaced and maintained. Always consult manufacturer guidance and use appropriate ammunition.
Q: Does the handguard accept accessories?
A: The M-LOK interface supports a wide range of direct-mount accessories like lights, grips, and sling QD sockets.
Q: Is the gas system included and installed?
A: Pistol uppers are typically shipped with a matched gas system installed. Exact specs can vary; verify details with your retailer.
Compliance, Safety & Legal
Know your local laws: Overall length, brace/stock configuration, and transport rules vary by jurisdiction. Ensure your build complies with all federal, state, and local regulations.
Build and maintain responsibly: Follow torque values, use quality tools, and confirm proper headspace and function before live fire. If you’re not sure, consult a qualified armorer.
Range etiquette: Use approved ammo, observe safe handling, and follow your range’s SOPs.
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Upgrade your compact AR-platform build with the TacFire BU-556-10 Pistol Upper Assembly—a durable, optics-ready package featuring a 10" black-nitride barrel, 7075-T6 black anodized receiver, free-float M-LOK handguard, and included BCG for fast, confident assembly and great range days.
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