TacFire 10.5" Unassembled AR 300 Blackout Pistol Build Kit with Lower Parts Kit

The TacFire 10.5" Unassembled AR 300 Blackout Pistol Build Kit with Lower Parts Kit is purpose-built for shooters and builders seeking to assemble a short-range, subsonic-capable AR platform pistol. This kit addresses a critical niche in tactical and civilian defense: the 300 Blackout cartridge delivers effective ballistics in compact form without the regulatory complications of short-barreled rifles. Whether for home defense, specialized training, or precision builds, the 10.5" configuration balances velocity retention with maneuverability in confined spaces—a priority among law enforcement agencies and military personnel working with suppressed systems.

This pistol kit features a black parkerized barrel with a 1:7 twist rate optimized for both subsonic and supersonic 300 Blackout loads, paired with a 5/8x24 spiral-fluted Krink-style muzzle device designed to reduce felt recoil and muzzle rise during rapid fire sequences. The 7075-T6 billet aluminum stripped upper receiver provides superior rigidity and impact resistance compared to forged alternatives, ensuring zero shift and reliability across extended shooting sessions. The slim M-Lok free-float handguard eliminates contact with the barrel, promoting accuracy, while the included 5.56 bolt carrier group (compatible with 300 Blackout through standardized AR platform dimensioning) ensures reliable cycling. Parkerized finish resists corrosion in humid environments—a proven military-grade protective coating valued in tactical applications.

Law enforcement armorer instructors and serious AR builders benefit most from unassembled kits, as hands-on assembly reinforces platform familiarity and permits customization of critical components before final configuration. The lower parts kit inclusion eliminates sourcing headaches for critical compliance and function items. This build kit is fully compatible with standard AR-15 lower receivers, magazines, and aftermarket components, giving operators complete control over trigger geometry, stock configuration, and optic mounting. At 5.19 lbs unassembled, the completed pistol will remain lightweight enough for tactical work while maintaining the 300 Blackout's proven performance in sound-suppressed environments. Installation requires basic gunsmith tools and familiarity with AR assembly; refer to manufacturer resources and certified instruction for safe completion.