The TacFire 7.5″ Unassembled AR 300 Blackout Pistol Build Kit (brand part no. PK300LPK-7) gives builders nearly every part needed for a compact 300 Blackout pistol project. The kit centers on a black parkerized 7.5″ barrel with a 1:7 twist rate and a 5/8×24 spiral-fluted Krink-style muzzle device, paired with a slim M-LOK free-float handguard and a 7075-T6 billet aluminum stripped upper. A 5.56 bolt carrier group, mil-spec charging handle, dust cover, forward assist, heavy pistol buffer, pistol-length gas tube, low-profile gas block, complete pistol buffer tube, A2 black pistol grip, and lower parts kit round out the build — all manufactured in the USA. A stripped lower receiver is required separately to complete the build.

Key Specifications

• Includes a black parkerized 7.5″ barrel with a 1:7 twist rate.
• Barrel is fitted with a 5/8×24 spiral-fluted Krink-style muzzle device.
• Features a slim M-LOK free-float handguard.
• Built around a 7075-T6 billet aluminum stripped upper.
• Includes a 5.56 bolt carrier group and mil-spec charging handle.
• Comes with a complete pistol buffer tube assembly and A2 black pistol grip.
• Ships with a full lower parts kit for finishing the build.
• Constructed of steel and aluminum with a black parkerized finish.
• All components are manufactured in the USA.

Frequently Asked Questions

Does this kit include a stripped lower receiver? No, a stripped lower receiver is required separately to complete the build.

What twist rate is the barrel? A 1:7 twist rate, suited to a range of 300 Blackout bullet weights.

What handguard does it use? A slim M-LOK free-float handguard.

Buy the TacFire 7.5in 300 Blackout Pistol Build Kit

Start your next 300 Blackout pistol build with nearly every part in one box. Order the TacFire Pistol Build Kit from our Lubbock, Texas gun shop for fast, insured shipping — or browse more AR lower parts kits.