ATI ATIG15MS300ML7B MilSport 8.5" 31-Round Threaded Barrel Pistol

The ATI ATIG15MS300ML7B MilSport 300 Blackout rifle represents a purpose-built platform for shooters and professionals who demand suppressed-fire capability in a compact, modular package. Chambered in 300 Blackout—a cartridge purpose-designed for subsonic ammunition and sound suppression—this 8.50" barrel pistol delivers the ballistic performance required for close-quarters tactical applications, home defense, and specialized law enforcement roles where noise signature matters. The MilSport platform bridges civilian modularity with military-grade ergonomics, making it ideal for both seasoned operators and shooters transitioning from AR-platform systems.

Built around a matte black polymer Picatinny rail receiver, the ATI MilSport features a black nitride-finished threaded barrel—essential for mounting sound suppressors and optimizing subsonic ballistics. The 7" M-LOK handguard provides modern rail real estate for lights, lasers, and vertical foregrips while minimizing overall length and weight to 7.15 lbs, a critical advantage in confined spaces. Nitride hardening resists corrosion and wear, critical for duty weapons exposed to variable environments. The black polymer grip maintains ergonomic consistency with standard AR controls, reducing manual of arms training time for operators familiar with conventional platforms. A 30+1 round capacity supports extended engagement scenarios without frequent magazine changes.

Law enforcement specialized response teams, military support personnel, and civilian users pursuing subsonic host platforms will find the ATI MilSport a reliable, cost-effective entry point into 300 Blackout. The threaded barrel accepts standard 1/2x28 TPI suppressors, enabling seamless integration with existing sound-suppression infrastructure. At 28 inches overall length with the adjustable stock, this rifle maintains maneuverability in vehicles and structures while retaining sight radius and magazine accessibility. Installation is straightforward for users with basic AR platform familiarity; no gunsmithing is required for standard duty or recreational use.