TacFire BU-556-7 Pistol Upper Assembly 5.56x45mm NATO Caliber with 7" Black Nitride Barrel, Black Anodized 7075-T6 Aluminum Receiver & M-LOK Handguard for AR-Platform Includes Bolt Carrier Group BU5567

TacFire BU-556-7 Pistol Upper Assembly — 5.56x45mm NATO, 7" Black Nitride Barrel, Black Anodized 7075-T6 Receiver & M-LOK® Handguard — Includes Bolt Carrier Group (BU5567 | UPC 729205500503) Build a compact, reliable AR pistol without the parts hunt. The TacFire BU-556-7 Pistol Upper Assembly delivers a turnkey top end for your AR-15, pairing a 7" black nitride barrel with a rugged black anodized 7075-T6 aluminum receiver and a slim, free-float M-LOK® handguard. Chambered in 5.56x45mm NATO, this upper ships complete with a Bolt Carrier Group (BCG), so you can mount an optic, pin it to a mil-spec lower, and head to the range with confidence. Why Choose the TacFire BU-556-7 Upper? Ready-to-Run Package: Comes BCG included—no scrambling for compatible carriers or headspacing variables. Ideal 7" Barrel Length: A proven sweet spot for AR pistols—more dwell time than extreme micro barrels for smoother cycling while staying compact for CQB-style drills. Black Nitride Barrel: Hard, corrosion-resistant finish on the bore and exterior for long service life and easier cleanup. 7075-T6 Forged Receiver: Stronger-than-6061 aluminum for a durable, duty-ready upper that holds up to high-volume training. Free-Float M-LOK® Handguard: Low-profile rail accepts lights, QD sling cups, handstops, and switches while keeping the barrel free-floated for better POI consistency. AR-Platform Compatibility: Designed around mil-spec AR-15 lowers for straightforward mating and reliable operation. Key Features & Specs Model / Part: BU-556-7 (also listed as BU5567) UPC: 729205500503 Caliber: 5.56x45mm NATO (compatible with .223 Rem—verify ammo with your chamber) Barrel: 7" black nitride steel, threaded muzzle (commonly 1/2x28—confirm before ordering a device) Receiver: 7075-T6 aluminum, black anodized Handguard: Free-float M-LOK®, slim and ventilated for cooling and cable routing Bolt Carrier Group: Included (carrier, bolt, cam pin, firing pin, retaining pin) Charging Handle: Not always included—verify retailer BOM Gas System: Short configuration matched to 7" length (spec may vary by lot; check listing) Performance You’ll Notice Smoother Cycling: The added barrel length vs. ultra-short builds can improve gas timing and reliability with quality 5.56 ammo. Low Maintenance: Black nitride hardens critical surfaces and resists fouling for easier wipe-downs after long sessions. Free-Float Accuracy: By isolating the handguard from the barrel, you get steadier point of impact—useful even on compact uppers. Accessory-Ready: Ample M-LOK® real estate for a white light, pressure pad, and handstop without adding bulk. Ideal Use Cases Home & Property Training: Compact OAL for maneuvering in tight spaces (follow all laws). Range & CQB Drills: Fast handling paired with a micro red dot for practical carbine practice. Truck/Pack Projects: Lightweight, rugged top end for mobility and emergency preparedness. Setup, Compatibility & Build Notes Lower Receiver: Fits most mil-spec AR-15 lowers. Buffer System: Use a pistol-appropriate buffer and spring; short-gas builds may prefer heavier buffers—tune as needed. Muzzle Devices: Confirm thread pitch before installing a brake, flash hider, or suppressor mount; re-torque and re-zero afterward. Optics & Sights: Add BUIS or a micro red dot; verify co-witness heights with your preferred mount. Ammo: Full-power 5.56 NATO loads often cycle short systems more reliably than lighter .223 loads. Best Practices (Non-Instructional) Lube & Inspect: Lightly lubricate the BCG and rails before first use; confirm gas-block and handguard screws are snug. Ejection Pattern Check: Evaluate ejection and lock-back; tune with buffer/spring if needed for your ammo. Cable Management: If running a light/laser, use M-LOK® cable clips or channels to avoid snags. Zero Smart: A 25/50-yard zero works well for compact 5.56 setups; confirm holds at your typical distance. Legal & Safety Reminder Know and follow federal, state, and local laws regarding AR pistol configurations, barrel length, braces/stocks, NFA regulations, suppressors, and transport. Ensure any modifications keep your build compliant. What’s in the Box* TacFire BU-556-7 Pistol Upper Assembly — 5.56 NATO, 7" black nitride barrel Bolt Carrier Group (BCG) — included 7075-T6 black-anodized receiver & free-float M-LOK® handguard *Contents can vary by lot—verify the retailer’s bill of materials (e.g., charging handle, muzzle device inclusion). SEO-Friendly Search Terms TacFire 7" 5.56 pistol upper, BU-556-7, BU5567, 729205500503, AR-15 pistol upper with BCG, black nitride 7 inch barrel upper, 7075-T6 forged upper anodized black, M-LOK free-float handguard upper, compact 5.56 AR upper assembly, TacFire AR pistol top end. TacFire BU-556-7 Pistol Upper Assembly — 5.56x45mm NATO, 7" Black Nitride Barrel, 7075-T6 Receiver, M-LOK® Handguard, BCG Included (BU5567 | 729205500503): a compact, accessory-ready upper that blends durability, reliability, and plug-and-play convenience for your next AR pistol build. The End