TacFire BU-300-10 Pistol Upper Assembly — .300 Blackout, 10" Black Nitride Barrel, M-LOK Handguard, 7075-T6 Receiver, Includes BCG (BU30010 • UPC 729205508325)
Build a compact, hard-hitting AR pistol with the TacFire BU-300-10. Purpose-built around the versatile .300 Blackout cartridge, this complete pistol upper features a 10" black nitride barrel for reliable velocity with both supers and subs, a tough black anodized 7075-T6 aluminum receiver, a slim free-float M-LOK® handguard, and it includes a bolt carrier group so you can get on the range sooner. If you want modern performance in a compact package, this upper brings accuracy, durability, and clean ergonomics to your AR-platform build.
Why Choose This TacFire .300 BLK Upper
.300 BLK versatility: Optimized for both supersonic and subsonic loads; ideal for short barrels and suppressor use (where legal).
10" nitride barrel: Black nitride treatment enhances corrosion resistance, surface hardness, and easy cleaning for high round counts.
Ready to run: Includes BCG, saving time and hassle sourcing parts.
Free-float accuracy: Rigid M-LOK handguard keeps pressure off the barrel for better consistency and repeatable POI.
Duty-grade receiver: 7075-T6 upper offers excellent strength-to-weight with a clean black anodized finish.
Key Features at a Glance
Caliber: .300 AAC Blackout
Barrel Length: 10", black nitride finish, threaded muzzle (thread protector or muzzle device varies by seller)
Receiver: 7075-T6 aluminum, black anodized
Handguard: Free-float M-LOK for lightweight accessory mounting (lights, grips, QD sockets, etc.)
BCG Included: Yes — bolt carrier group included for a true plug-and-play upper
Platform: AR-15 pattern (pistol/SBR builds; verify local laws)
Model / UPC: BU30010 / 729205508325
Designed for Real-World Performance
Short-barrel efficiency: The 10" length balances maneuverability with downrange performance, especially with modern .300 BLK loads.
Cleaner cycling: Nitride-finished bore and extension aid smooth feeding and easy carbon cleanup.
Accessory-ready: M-LOK slots at useful clock positions make it simple to add a white light, hand stop, or sling attachments without bulk.
Balanced handling: Slim handguard profile and compact barrel keep weight forward but nimble for fast target transitions.
Ideal Use Cases
Home-range training & PCC-style drills with soft-shooting subsonics (where appropriate).
Suppressed shooting (verify thread pitch and local laws; use a properly tuned gas system).
Truck/ranch gun or compact carbine roles requiring fast handling and reliable function.
Note: Always match .300 BLK uppers with .300 BLK ammunition only. Never fire .223/5.56 in a .300 BLK chamber.
Compatibility & Setup
Lower receiver: Pairs with any standard AR-15 lower. For pistol setups, use a pistol buffer system; for SBRs, follow NFA rules.
Magazines: Quality .300 BLK-labeled AR magazines recommended to avoid ammo mix-ups.
Gas & tuning: For suppressed use, consider adjustable gas blocks/buffers for optimal cycling.
Installation Tips (Best Practices)
Verify clear & safe: Ensure your lower is unloaded and safe to work on.
Join receivers: Align the upper to your AR-15 lower and push in the pivot/takedown pins.
Function check: Cycle the action, check BCG movement, and confirm charging handle function.
Muzzle device: Torque and time per spec if changing devices; confirm thread pitch (commonly 5/8x24 for .300 BLK—verify).
Zero with your load: POI can vary significantly between supersonic and subsonic ammo; zero accordingly.
Specifications
Brand/Series: TacFire
Product Type: Complete pistol upper assembly
Caliber: .300 Blackout
Barrel: 10", black nitride, threaded
Receiver: 7075-T6 aluminum, black anodized
Handguard: Free-float M-LOK
Bolt Carrier Group: Included
Model Number: BU-300-10 (BU30010)
UPC: 729205508325
(Gas system length, twist rate, and exact handguard length may vary by production batch. If you need precise specs for suppressor setup or ballistic calculators, confirm with your retailer’s current listing.)
Safety & Compliance
Assemble and use in accordance with local, state, and federal laws.
Pistol/SBR configurations may require specific braces/stocks or NFA paperwork—verify before assembly.
Always wear eye/ear protection and follow safe firearm handling practices.
SEO Metadata (Merchant-Ready)
SEO Title: TacFire BU-300-10 .300 Blackout 10" Pistol Upper — Nitride Barrel, 7075-T6 Receiver, M-LOK, Includes BCG
Meta Description (≤160 chars): Build a compact AR with the TacFire BU-300-10 .300 BLK upper. 10" nitride barrel, 7075-T6 receiver, M-LOK handguard, includes BCG.
Target Keywords: TacFire BU-300-10, .300 Blackout pistol upper, 10" nitride barrel AR, M-LOK .300 BLK upper, 7075-T6 AR upper, BU30010 BCG included
FAQ
Q: Does this upper include a bolt carrier group?
A: Yes. The BU-300-10 includes a BCG so you can assemble and run your build faster.
Q: What thread pitch is the muzzle?
A: .300 BLK commonly uses 5/8x24—verify your exact unit before installing a device or suppressor.
Q: Will this fit my AR-15 lower?
A: Yes—this is an AR-15 pattern upper. For pistol builds use a pistol buffer system; SBRs require compliance with NFA regulations.
Q: Can I shoot both subsonic and supersonic ammo?
A: Yes. .300 BLK is designed for both. Expect different POI/ cycling; tuning may be helpful, especially when suppressed.
Q: Are sights included?
A: Typically no. Add your preferred iron sights or optic to the top rail and M-LOK accessories as needed.
Compact, capable, and ready to run—the TacFire BU-300-10 .300 Blackout Pistol Upper gives your AR build the short-barrel performance, durability, and accessory flexibility you want, with the BCG included to seal the deal.
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