TacFire BU-308-20 Rifle Upper Assembly — .308 Win, 20" Black Nitride Barrel, 7075-T6 Receiver, M-LOK® Handguard — Includes Bolt Carrier Group (BU30820 | UPC 729205502378)

Build a long-range, hard-hitting .30-cal AR the smart way. The TacFire BU-308-20 Rifle Upper Assembly delivers a precision-minded .308 Winchester top end with a 20" black nitride barrel, a rugged 7075-T6 aluminum receiver finished in black anodize, and a slim, free-float M-LOK® handguard for modern accessory mounting. Best of all, it includes a Bolt Carrier Group (BCG)—so you can skip the parts hunt and head to the range sooner with a matched, reliable system.

Why Choose the TacFire BU-308-20 Upper?

• 20" Accuracy Advantage: Extra barrel length wrings out velocity for heavier .308 loads, flattens trajectory, and tightens wind drift—ideal for hunting and steel out to distance.

• Black Nitride Barrel: Enhanced wear and corrosion resistance inside and out; easier carbon cleanup versus untreated steel.

• 7075-T6 Strength: Forged receiver provides superior strength-to-weight for a durable, duty-ready build.

• Free-Float M-LOK® Rail: Keep the barrel free from external pressure while mounting lights, bipods, QD cups, and handstops exactly where you want them.

• BCG Included: A matched .308/7.62 carrier and bolt simplify headspace considerations and promote reliable cycling.

Key Features & Specifications

• Model / Part: BU-308-20 (also listed as BU30820)

• UPC: 729205502378

• Caliber: .308 Winchester (7.62×51 NATO use depends on chamber spec; verify ammunition compatibility)

• Barrel: 20", black nitride finish, threaded muzzle (commonly 5/8x24—confirm before buying a device)

• Gas System: Rifle-length configuration typical for 20" .308 barrels (verify exact spec with seller)

• Receiver: 7075-T6 aluminum, black anodized

• Handguard: Free-float M-LOK®, slim profile with continuous top rail

• Bolt Carrier Group: Included (.308/7.62 BCG with bolt, carrier, cam pin, firing pin, retaining pin)

• Charging Handle: Check retailer BOM (often sold separately)

• Muzzle Device: Varies by lot—confirm inclusion

Performance You’ll Notice

• Extended-Range Precision: 20" barrel length improves muzzle velocity for 155–178gr bullets, helping stabilize flight and reduce vertical spread.

• Cleaner Running: The nitride bore sheds fouling more easily, cutting down time on the cleaning rod.

• Steady Point of Impact: Free-float rail prevents sling/bipod pressure from shifting zero when you load into barricades or tripods.

• Accessory-Ready: M-LOK® slots at 3/6/9 (and often 45°) let you place a bipod, Arca adapter, white light, or handstop without bulk.

Ideal Use Cases

• Big-Game & Predator Hunting: Pair with a 2-10× or 3-15× optic for confident, ethical shots across mixed terrain.

• Practical Precision / DMR-Style Builds: Ring steel from 300 to 800+ yards with quality ammo and good dope.

• Ranch / Property Rifle: Robust finishes and modular rail for lights and slings in all weather.

Compatibility & Build Notes

• Lower Receiver Pattern: Use with a compatible AR-10/.308 AR lower (commonly DPMS/LR-308 pattern). Confirm your lower’s pattern, rail height, and barrel-nut/handguard compatibility.

• Buffer System: Install a .308-specific buffer, spring, and tube; tune buffer weight for proper ejection/lock-back with your ammo.

• Magazines: Choose reliable SR-25/DPMS-pattern .308 magazines for consistent feeding.

• Muzzle Devices / Suppressors: Confirm thread pitch; re-torque and re-zero after installing brakes, flash hiders, or mounts.

• Optics & Sights: The continuous top rail supports LPVOs, mid-power scopes, or BUIS; verify mount height for eye relief and cheek weld.

Setup Tips (Non-Instructional)

1. Lube & Inspect: Lightly oil the BCG and contact surfaces before first range trip; verify gas-block and handguard fasteners.

2. Ammo Selection: Start with proven .308 loads (150–175gr) to baseline accuracy; then tailor for hunting or match needs.

3. Zero Smart: A 100-yard zero is versatile; confirm drops at 200/300/400+ for your specific bullet.

4. Manage Recoil: Consider a quality brake or suppressor (where legal) plus buffer tuning for faster follow-ups and easier spotting.

5. Torque Discipline: Follow spec on scope rings, mounts, and muzzle devices to preserve accuracy.

Maintenance & Care

• Nitride Ease: Patch the bore with solvent and a few passes of a nylon/bronze brush as needed; apply a light oil film after cleaning.

• Fastener Checks: Re-check handguard clamp/barrel nut and gas-block screws after break-in.

• Exterior Protection: Wipe metal with a corrosion inhibitor after wet or salty exposure.

What’s in the Box*

• TacFire BU-308-20 .308 Win Upper — 20" black nitride barrel, 7075-T6 black-anodized receiver, free-float M-LOK® handguard

• .308/7.62 Bolt Carrier Group (BCG) — included
  *Charging handle and muzzle device may be sold separately—verify the retailer’s bill of materials.

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TacFire BU-308-20 Rifle Upper Assembly — .308 Win, 20" Black Nitride Barrel, 7075-T6 Receiver, M-LOK® Handguard, BCG Included (BU30820 | 729205502378): a velocity-boosting, accuracy-focused .308 AR upper that blends durability, modularity, and turnkey convenience for hunting, practical precision, and serious range work.

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