The TacFire 9mm AR pistol build kit (brand part no. SSPK9MMLPK4) bundles the parts to assemble a 9mm AR pistol around a 4.5-inch USA-made barrel, using a semi-automatic action with a manual thumb safety. TacFire pairs the barrel with a matched 9mm bolt carrier group, a mil-spec upper receiver made in the USA, and a 4-inch slim free-float M-LOK handguard. The kit also includes a complete lower parts kit, a mil-spec pistol buffer tube with a foam cover, a heavy buffer and spring, and a 1/2×36-threaded flash hider. It does not include a stripped lower receiver, so it is built onto a lower you supply.

Key Specifications

• The kit includes a 9mm, 4.5-inch USA-made barrel for a compact pistol build.
• It includes a matched 9mm bolt carrier group, fitted to the barrel.
• The upper is a mil-spec upper receiver made in the USA.
• The handguard is a 4-inch slim free-float M-LOK, which keeps hand pressure off the barrel.
• It includes a complete lower parts kit, also made in the USA.
• The buffer tube is a mil-spec aluminum pistol tube with a foam cover, not a shoulder-stock tube.
• It includes a heavy buffer and buffer tube spring, suited to the 9mm blowback system.
• It includes a mil-spec charging handle, dust cover and forward assist for the upper.
• The muzzle device is a 1/2×36-threaded flash hider, sized to the 9mm barrel.
• The controls use a manual thumb safety and a semi-automatic action.

Frequently Asked Questions

Does this kit include a lower receiver? No. It supplies a complete lower parts kit, so the stripped lower receiver is provided by the builder.

Is this a pistol or a rifle kit? It ships with a mil-spec pistol buffer tube rather than a shoulder-stock tube, so it is built as an AR pistol.

What barrel does it use? A 4.5-inch, 9mm USA-made barrel with a matched 9mm bolt carrier group.

Buy the TacFire 9mm AR Pistol Build Kit, 4.5-Inch Barrel

Having the upper, lower parts and buffer system in one box makes a 9mm AR pistol a simpler build. Order it from our Lubbock, Texas gun shop for fast, insured shipping, and browse more AR-15 build kits for your lower.