The Tacfire 10.5" unassembled AR 300 Blackout pistol build kit gives you a complete, US-made platform to assemble a short-barreled AR pistol chambered in the hard-hitting .300 Blackout cartridge. This is a full lower parts kit and upper assembly combo — everything you need to put together a compact, modular shooter. Whether you're building a backpack-friendly patrol rifle, a truck gun, or a suppressor-ready short-range platform, the Tacfire kit gets you the critical components without forcing you to hunt down parts from five different suppliers.

The upper starts with a 10.5" parkerized barrel cut with a 1:7 twist rate, optimized for the ballistics of .300 Blackout across a range of bullet weights. A 5/8x24 spiral-fluted muzzle device in Krink-style geometry is already threaded and ready for a suppressor or flash hider. The billet aluminum stripped upper receiver is 7075-T6 — a tough, dimensionally stable alloy favored for precision builds. Up top you'll find a slim M-Lok free-float handguard that keeps your furniture clear of the barrel for consistent accuracy, paired with a mil-spec 5.56 bolt carrier group and charging handle. Gas-side components include a low-profile gas block and pistol-length gas tube, tuned for reliable cycling in a short package.

The lower parts kit is complete and ready to install: mil-spec fire control group, safety selector, magazine release, trigger guard, buffer assembly with heavy buffer, pistol buffer tube, and A2 pistol grip in black. Everything is parkerized or anodized for durability. This is a no-BS, all-USA-made build kit — no surprises, no missing parts. Assemble it yourself, follow proper AR-15 assembly procedure, and you've got a legal, compact .300 Blackout pistol that punches well above its footprint.

The Tacfire 10.5" unassembled AR 300 Blackout pistol build kit gives you a complete, US-made platform to assemble a short-barreled AR pistol chambered in the hard-hitting .300 Blackout cartridge. This is a full lower parts kit and upper assembly combo — everything you need to put together a compact, modular shooter. Whether you're building a backpack-friendly patrol rifle, a truck gun, or a suppressor-ready short-range platform, the Tacfire kit gets you the critical components without forcing you to hunt down parts from five different suppliers.

The upper starts with a 10.5" parkerized barrel cut with a 1:7 twist rate, optimized for the ballistics of .300 Blackout across a range of bullet weights. A 5/8x24 spiral-fluted muzzle device in Krink-style geometry is already threaded and ready for a suppressor or flash hider. The billet aluminum stripped upper receiver is 7075-T6 — a tough, dimensionally stable alloy favored for precision builds. Up top you'll find a slim M-Lok free-float handguard that keeps your furniture clear of the barrel for consistent accuracy, paired with a mil-spec 5.56 bolt carrier group and charging handle. Gas-side components include a low-profile gas block and pistol-length gas tube, tuned for reliable cycling in a short package.

The lower parts kit is complete and ready to install: mil-spec fire control group, safety selector, magazine release, trigger guard, buffer assembly with heavy buffer, pistol buffer tube, and A2 pistol grip in black. Everything is parkerized or anodized for durability. This is a no-BS, all-USA-made build kit — no surprises, no missing parts. Assemble it yourself, follow proper AR-15 assembly procedure, and you've got a legal, compact .300 Blackout pistol that punches well above its footprint.