TacFire .300 AAC Blackout AR Build Kit 10.5″ Barrel Pistol

Description

The 10.5" barrel is the sweet spot for .300 AAC Blackout, and TacFire built this kit around exactly that. This length gives you most of the velocity you'd get from a 16" barrel in a package that's noticeably shorter and easier to handle, which is why so many folks land on 10.5" for suppressed and short-barrel builds. It runs both supersonic and heavy subsonic loads well, so you can swap between quiet plinking and hard-hitting range work depending on what you feed it.

What Comes in the TacFire .300 Blackout Kit

This is a genuinely loaded kit. You get a .300 AAC Blackout 10.5" parkerized steel barrel, a .308 spiral fluted flash can with crush washer, a .750 low-profile gas block, a pistol-length gas tube with pin, and an ultra-slim 7" clamp-on M-LOK free float handguard. On the receiver side there's a stripped billet upper machined for 5.56/.223/.300 with M4 feed ramps, a 5.56 NATO bolt carrier group that's been MPI tested and nitride coated, a mil-spec charging handle with steel latch, plus a dust cover and forward assist. The lower components include a USA-made lower parts kit, an A2-style pistol grip, receiver end plate, castle nut, pistol buffer tube with foam, and a 3 oz buffer with spring. The 5/8"x24 muzzle threads are the standard pitch for .300 BLK cans and brakes, so mounting is straightforward.

Finishing Your TacFire AR Pistol Build

One thing worth knowing up front: this is a build kit, not a complete firearm. You'll supply a stripped lower receiver to complete the project, since the same nitride bolt works for both 5.56 and .300 Blackout. Basic assembly tools like an armorer's wrench, punch set, and torque wrench make the job smooth. For a lot of builders that's the whole appeal here. You control every part of the setup and learn the platform inside and out, and you end up with a compact .300 BLK host that's a natural fit for a suppressor down the road.