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This TacFire kit takes a stripped lower receiver and turns it into a running 300 Blackout pistol without you hunting down parts one at a time. The heart of it is a 7.5" parkerized barrel with a 1:7 twist and a pistol-length gas system, which is one of the most popular setups builders reach for when they want something short, handy, and suppressor-friendly down the road. That fast twist does a nice job stabilizing the heavier subsonic bullets 300 BLK is known for, and the barrel wears a 5/8×24 muzzle with a bird cage style device already threaded on.
Everything on the upper side is here: a 7075-T6 billet aluminum stripped upper with M4 feed ramps, a 5.56/300 BLK NATO bolt carrier group, a Mil-Spec aluminum charging handle with steel latch, plus the dust cover and forward assist. The gas system runs a .750 low-profile gas block and a pistol-length gas tube. Wrapping it all up is an ultra slim 7" M-LOK free-float handguard, which keeps the front end trim and gives you plenty of real estate for a light, hand stop, or sling mount.
The lower side is just as covered. You get a complete USA-made lower parts kit with trigger and hammer, an A2 style black pistol grip, and a full pistol buffer tube assembly including the foam-wrapped tube, buffer, spring, castle nut, and receiver end plate. Drop in your stripped lower and the small stuff is already sorted.
A quick note on 300 Blackout out of a 7.5" barrel: it eats supersonic loads all day for plinking and hunting, and it's a natural home for heavy subsonic ammo if you add a can later. Short barrels can leave a little unburnt powder behind with subs, so a good cleaning routine keeps things happy. This is a straightforward, budget-minded way to get a build off the ground, and the parts are all standard AR-15 spec so upgrades down the line are easy.
You'll need a stripped lower receiver to build on, since that's the one serialized part not included in the kit. Everything else to finish a working pistol is here, from the barreled upper components to the complete lower parts kit and buffer assembly. Basic assembly tools like an armorer's wrench, punches, and a vise block will make the job go smoothly.
A 7.5" barrel is one of the most popular lengths for compact 300 BLK pistols because it stays short and handy while still cycling reliably. It runs supersonic ammo well for plinking and hunting, and the 1:7 twist stabilizes heavier subsonic bullets nicely if you add a suppressor later. Just know that very short barrels can leave a bit of unburnt powder behind with subsonic loads, so plan on a regular cleaning routine.
For everyday shooting, supersonic loads in the 110 to 150 grain range are reliable and easy on the wallet. If you go suppressed, heavy subsonic bullets around 200 to 220 grains stay below the sound barrier and pair well with the fast twist. The same loads that run well in longer 300 BLK barrels tend to run well here too.
Yes, the components follow standard AR-15 dimensions, so future upgrades and replacements are straightforward. The upper, bolt carrier group, and handguard all use common patterns, and the lower parts kit is a normal Mil-Spec setup. That makes it easy to swap in a different trigger, grip, or muzzle device down the road.
| UPC | 811261029033 |
|---|---|
| Manufacturer | |
| Manufacturer Part Number | PK300LPK-7 |
| Shipping Weight | 4.655 |
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