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The TacFire BU-556-5 takes the guesswork out of putting together a short 5.56 build. It shows up as a complete upper chambered in 5.56x45mm NATO, built around a 5-inch barrel that's been treated with a black nitride finish for solid wear and corrosion resistance. Since it already includes the bolt carrier group, this is close to a bolt-on affair: pop it onto a compatible mil-spec lower, run your charging handle, and you're most of the way to a finished compact AR pistol or short-barrel setup.
The barrel is cut from 4150 chrome moly vanadium steel, which is the same tough material you'll find on plenty of duty-grade barrels, and it wears an A2 flash hider on 1/2×28 threads. That standard thread pitch means swapping the muzzle device for a brake, comp, or your own preferred can down the line is painless. The upper receiver itself is 7075-T6 aluminum with a black anodized finish, so it matches up cleanly with just about any AR lower you already own.
It ships optic-ready with no fixed sights, which is the smart move on a barrel this short. Mount a red dot, an LPVO, or flip-up irons on the full-length Picatinny top rail and set it up exactly how you like. The M-LOK handguard gives you a slim, modern platform to hang a light, a hand stop, or a sling mount without adding bulk, and the shorter rail keeps the whole package handy for tight quarters.
Budget-minded builders have leaned on TacFire uppers for exactly this reason: you get a complete, assembled unit with the BCG in the box at a price that leaves room for the rest of the build. Feedback on these uppers tends to point to clean assembly and reliable cycling once installed, making the BU-556-5 a practical starting point for a first compact build or a no-fuss backup upper to keep on the shelf.
Yes, the BU-556-5 includes a bolt carrier group in the box, which is a big part of what makes it a near bolt-on upper. Listings across retailers consistently confirm the BCG is included. A charging handle is not always listed as part of this assembly, so plan to have one on hand to complete your build.
It's built on a standard 7075-T6 mil-spec upper receiver, so it mates up with any compatible mil-spec AR-15 or AR pistol lower. Buyers regularly report clean fitment and reliable cycling on common lowers. Just make sure you have the correct buffer and spring setup for a short 5.56 configuration.
No, it ships optic-ready with no fixed sights, which is common on a short barrel like this. The full-length Picatinny top rail lets you add a red dot, an LPVO, or flip-up backup irons based on how you want to run it.
You can. The barrel uses standard 1/2×28 threading and comes with an A2 flash hider installed. That means you can swap in a muzzle brake, compensator, or a compatible suppressor mount without any special adapters.
| UPC | 659725496003 |
|---|---|
| Manufacturer | |
| Manufacturer Part Number | BU5565 |
| Action | |
| Barrel Finish | Black Nitride |
| Barrel Length | 5" |
| Caliber/Gauge | .223 REM/5.56 NATO |
| Product Type | Complete |
| Shipping Weight | 3.2 |
| Sights | None, Optic Ready |
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