The TacFire AR-15 Pistol Build Kit (brand part no. SSPK300LPK7K) bundles the major components needed for a 300 Blackout AR pistol build into one unassembled package, giving builders a matched set of parts instead of sourcing each piece separately. The kit centers on a 7.5-inch parkerized barrel paired with a pistol-length gas system, both made in the USA, along with a 5.56/300 Blackout NATO bolt carrier group. A 7-inch Ultra Slim KeyMod free-float handguard with detachable rails handles accessory mounting, and a complete lower parts kit with trigger and hammer covers the internals a builder needs on the lower side. Rounding out the kit are a .750 gas block, pistol-length gas tube, standard receiver end plate, Mil-Spec/Commercial castle nut, Mil-Spec buffer tube, 3-ounce buffer with spring, Mil-Spec charging handle, dust cover, forward assist, a 5/8-24 threaded bird cage A2 muzzle brake, a USA-made pistol grip, and an upper receiver machined for 5.56/223/300BLK with M4 feed ramps. This kit does not include a stripped lower receiver, so builders will need to source one separately to complete the build.

Key Specifications

• Includes a 7.5-inch parkerized barrel with a pistol-length gas system, both made in the USA.
• Ships with a 5.56/300 Blackout NATO bolt carrier group, made in the USA.
• Includes a 7-inch Ultra Slim KeyMod free-float handguard with detachable rails.
• Comes with a complete lower parts kit, including trigger and hammer, made in the USA.
• The muzzle is threaded 5/8-24 and includes an A2 bird cage muzzle brake.
• Includes an upper receiver machined for 5.56/223/300 Blackout with M4 feed ramps, made in the USA.
• Rounds out with a .750 gas block, Mil-Spec buffer tube, charging handle, dust cover, and forward assist.
• Does not include a stripped lower receiver, which must be sourced separately.

Frequently Asked Questions

Does this kit include a lower receiver? No, it includes a complete lower parts kit with trigger and hammer, but the stripped lower receiver itself must be purchased separately.

What caliber does this kit run? The upper and bolt carrier group are configured for 300 Blackout, with the upper receiver also machined to accept 5.56/223.

Is this kit assembled? No, it ships as an unassembled build kit for builders to put together with a separately sourced lower receiver.

Buy the TacFire AR-15 Pistol Build Kit, 300 Blackout, KeyMod, Black Steel

Start a 300 Blackout AR pistol build with a matched set of components in one order. Order it through our TacFire lineup of AR15 build kits, and we’ll get it ready to ship as soon as it’s available from our Lubbock, Texas gun shop.