The TacFire .300 Blackout AR-15 build kit (brand part no. RK300-LPK) gives builders every core part needed to assemble a pistol-configuration AR-15 in .300 AAC Blackout, unassembled and ready for your own build. The kit is centered on a 7.5-inch .300 Blackout barrel paired with a pistol-length gas system, a pistol buffer tube with foam, and a standard A2-style pistol grip, so it comes configured for a pistol build rather than a stocked rifle. A stripped billet upper receiver with M4 feed ramps, an ultra-slim 7-inch clamp-on M-LOK free-floating handguard, and a full USA-made lower parts kit round out everything needed to put a complete .300 Blackout pistol together.

Key Specifications

• Centered on a 7.5-inch .300 AAC Blackout barrel.
• Configured with a pistol-length gas system and pistol buffer tube with foam.
• Includes a 5/8×24 TPI spiral fluted flash can with a crush washer.
• Includes an AR-15 .750 micro low-profile gas block, mil-spec steel.
• Includes an ultra-slim 7-inch clamp-on M-LOK free-floating handguard.
• Includes a stripped billet upper receiver with M4 feed ramps.
• Includes an AR-15 mil-spec charging handle, aluminum with a steel latch.
• Includes a dust cover, forward assist, and standard receiver end plate.
• Includes a full USA-made AR-15 lower parts kit and a standard A2-style pistol grip.

Frequently Asked Questions

Does this kit include a stock? No, it’s configured as a pistol build with a pistol buffer tube and A2-style pistol grip, not a shoulder stock.

What barrel length does this kit use? A 7.5-inch .300 AAC Blackout barrel.

Is this kit assembled? No, it ships unassembled for you to build.

Buy the TacFire .300 Blackout AR-15 Pistol Build Kit

Build your own .300 Blackout pistol from the ground up. Order it from our TacFire lineup, part of our AR15 parts selection, and get it shipped fast from our Lubbock, Texas gun shop.