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The 300 Blackout was born for short barrels, and this TacFire kit leans right into that. You get a 10.5" black parkerized barrel with a 1:7 twist, which is the sweet spot for a caliber that has to handle both featherweight supersonic rounds and heavy subsonic loads without a barrel swap. Pair that with the included pistol-length gas tube and low profile .750 gas block, and you've got a setup that cycles reliably across the wide pressure range 300 BLK is known for. This is an unassembled kit, so you supply the stripped or complete lower and put the rest together yourself.
TacFire didn't skimp on the parts list. The kit ships with a 7075-T6 billet aluminum stripped upper with M4 feed ramps, an MPI-tested 5.56 NATO nitride bolt carrier group, a mil-spec aluminum charging handle with steel latch, dust cover, and forward assist. Up front you get an ultra-slim clamp-on M-LOK free-float handguard that keeps the profile lean and leaves plenty of room for a light, sling mount, or hand stop. The muzzle end wears a 5/8×24 spiral fluted Krink-style flash can with a crush washer, which gives it that unmistakable look and helps tame flash.
The lower side of the box is just as complete. You get a full USA-made AR-15 lower parts kit, an A2-style black pistol grip, a pistol buffer tube with foam cover, castle nut, receiver end plate, and a heavier buffer with spring. That heavier buffer is a smart touch for 300 Blackout since it helps smooth out cycling and cut down on felt recoil when you're running subsonic ammo.
Assembly takes a few common tools, a little patience, and some bench time. If you've been sitting on a lower waiting for a project, this is a straightforward way to end up with a compact, suppressor-friendly 300 Blackout pistol you built with your own hands. Just remember to keep your 300 BLK and 5.56 ammo clearly separated, since the two should never be mixed.
No, the lower receiver is not included. This is an unassembled kit that gives you the complete upper, bolt carrier group, and a full lower parts kit, but you supply your own stripped or complete lower to finish the build. That keeps the kit flexible so you can pair it with whatever lower you already have or prefer.
The 1:7 twist is the versatile choice for 300 Blackout because it stabilizes both light supersonic bullets and heavy subsonic loads without needing to swap barrels. The pistol-length gas system is standard for the caliber since 300 BLK needs a short gas system to cycle reliably, especially with lower-pressure subsonic ammo. Together they make for a setup that runs a wide range of loads.
You'll want a few common AR build tools like an armorer's wrench, a torque wrench, a vise block, and punches. The barrel nut and gas block installation are the steps that call for the most care, so take your time and torque to spec. If you've built an AR before, this kit will feel familiar.
Yes, the 10.5" barrel and pistol-length gas system make this a solid host for a suppressor, which is where 300 Blackout really shines with subsonic ammo. The 5/8×24 muzzle threads are the common 300 BLK thread pitch, so most cans and muzzle devices in that caliber will thread right on. Many builders pair a setup like this with subsonic loads for a quiet, compact package.
| UPC | 811261029040 |
|---|---|
| Manufacturer | |
| Manufacturer Part Number | PK300LPK-10 |
| Shipping Weight | 5.19 |
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