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The TacFire BU3005 is a complete .300 AAC Blackout upper assembly that drops right onto any mil-spec AR-15 lower. It's built around a 5-inch barrel finished in tough black nitride, paired with an M4 feed ramp receiver and a full bolt carrier group so you're not chasing down extra parts to finish the build. For anyone wanting a short, handy .300 BLK setup without piecing together a barrel, gas system, handguard, and BCG separately, this takes most of the guesswork out of it.
The short barrel wears a 1:8 twist, which is the sweet spot for .300 Blackout since it stabilizes everything from lightweight supersonic loads to those heavy 200-plus grain subsonic rounds. A micro-length gas system with a low-profile .750 gas block keeps the whole thing running in that tight 5-inch footprint, and the muzzle is threaded 5/8×24 with an A2 flash hider already installed, so swapping in a different muzzle device or can-ready setup is simple.
Up front you get a 4-inch M-LOK handguard that leaves room for a light or a hand stop without adding bulk. The nitride finish on the barrel does double duty here, cutting down on corrosion and giving the bore a slick, easy-to-clean surface that holds up well round after round. Since it ships as a complete unit with the dust cover, forward assist, and charging handle in place, most folks can have it torqued onto a lower and headed to the range the same day it arrives.
The .300 Blackout round itself is the real draw with a barrel this short. It was designed to give near full-power performance out of stubby barrels, which is exactly why a 5-inch upper like this one makes sense where a 5.56 setup would be losing steam. It's a solid pick for a compact truck-gun style build, close-range work, or just a fun, maneuverable range toy.
Yes. This is a complete upper assembly, so it ships with the bolt carrier group and charging handle already included. It also comes with the handguard, gas block, flash hider, forward assist, and dust cover installed, so all you need to add is a compatible lower to complete the build.
It's designed to fit standard mil-spec AR-15 lower receivers, which covers the vast majority of lowers on the market. Just clean the mating surfaces, drop in your takedown and pivot pins, and you're set. There's no gunsmithing required to attach it.
The .300 AAC Blackout cartridge was specifically developed to run efficiently out of very short barrels, where 5.56 tends to lose a lot of velocity and produce excessive flash. A 5-inch .300 BLK barrel keeps things extremely compact while still delivering respectable performance. It's a natural fit for tight, close-range, and maneuverable builds.
The barrel has a 1:8 twist rate, which is ideal for .300 Blackout because it stabilizes a wide range of bullet weights. That means it handles both lighter supersonic loads and the heavier subsonic projectiles well. The 5/8×24 threaded muzzle also leaves you room to run different muzzle devices.
| UPC | 729205967122 |
|---|---|
| Manufacturer | |
| Manufacturer Part Number | BU3005 |
| Action | |
| Barrel Finish | Black Nitride |
| Barrel Length | 5" |
| Caliber/Gauge | .300 AAC Blackout |
| Shipping Weight | 3.3 |
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