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This TacFire kit is built for the person who'd rather turn their own wrenches than buy a rifle off the rack. It gathers up nearly every part you need to complete a .300 AAC Blackout AR15, leaving only the stripped lower receiver for you to add. You get a 16-inch black nitride barrel, a stripped billet upper receiver cut for AR15 5.56/.223/.300 AAC with M4 feed ramps, a slim clamp-on M-LOK free float handguard, and the gas system to tie it all together. It's a solid way to save some cash and end up with a rifle you know inside and out.
The barrel runs a pistol-length gas system, which is exactly what you want for .300 Blackout. This cartridge produces less gas volume than 5.56, and the shorter gas system places the port closer to the chamber so the action gets enough pressure to cycle reliably, especially with heavy subsonic loads. TacFire also throws in a .308 spiral fluted flash can with a crusher washer, a low-profile micro gas block, a mil-spec charging handle with a steel latch, a forward assist, dust cover, and an A2-style pistol grip. The USA-made lower parts kit and pistol buffer tube assembly with a 3 oz buffer and spring round out the package.
.300 Blackout has two personalities in one chambering. Run supersonic loads and you've got a flat-shooting, hard-hitting round out to reasonable ranges. Drop in heavy subsonic ammo and pair it with a suppressor down the road, and it gets impressively quiet. The cartridge was designed to shine in compact AR platforms while feeding from standard AR15 magazines, so it's a natural fit for a home build like this one.
Builders who've put TacFire kits together tend to note that parts arrive individually packaged and organized, and go together without much fuss. It's positioned as a budget-friendly build, not a premium match rifle, and it delivers exactly that. You'll want a few basic AR tools like an armorer's wrench and a vise block, plus the stripped lower to finish the job.
No, this is a complete parts set minus the stripped lower receiver. You'll need to supply your own lower to finish the rifle. Everything else from the barrel and upper down to the lower parts kit and buffer assembly is included in the box.
Even on a 16-inch barrel, .300 Blackout runs best with a pistol length gas system because the cartridge produces less gas volume than 5.56. The shorter system places the gas port closer to the chamber, giving the action enough pressure to cycle reliably. This matters most when you're shooting heavy subsonic loads.
You'll want a basic set of AR15 build tools, including an armorer's wrench for the castle nut and barrel nut, a vise block to hold the receivers, and punches for the lower parts pins. None of it is exotic, and most home builders already have what they need. The kit itself arrives with parts individually packaged and ready to assemble.
.300 Blackout is one of the most suppressor-friendly cartridges in the AR15 platform, and this kit ships with a threaded muzzle, so it's a natural fit for adding a can later. Heavy subsonic ammo paired with a quality suppressor gives you an impressively quiet setup. The included pistol length gas system also helps keep things cycling with those lighter-pressure subsonic loads.
| UPC | 811261029859 |
|---|---|
| Manufacturer | |
| Manufacturer Part Number | RK300-LPK |
| Shipping Weight | 6.325 |
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