Upgrade your AR-15 with the One Horse 18" 6mm ARC Rifle 1:7.5 M-LOK Complete Upper, engineered for precision shooters and long-range enthusiasts seeking superior performance without compromise. This complete upper delivers the ballistic excellence of the 6mm ARC cartridge in a reliable, ready-to-install package, perfect for transforming your standard AR-15 lower into a flat-shooting powerhouse ideal for target practice, varmint hunting, or competitive shooting. Key Features 18-Inch Nitride/Melonite Barrel: Crafted from high-quality steel with a durable nitride finish for enhanced corrosion resistance and longevity, ensuring consistent accuracy even in harsh conditions. 1:7.5 Twist Rate: Optimized for stabilizing heavier 6mm ARC bullets (105-108 grains), promoting exceptional velocity and minimal drop at extended ranges up to 800 yards. Rifle-Length Gas System: Provides smooth, reliable cycling with reduced recoil, improving follow-up shots and shooter comfort during extended sessions. 15-Inch M-LOK Handguard: Free-floating design for maximum accuracy, with versatile M-LOK slots for mounting lights, grips, or bipods without adding unnecessary weight. Included Nitride BCG and Charging Handle: Bolt carrier group treated for smooth operation and easy maintenance, paired with a robust charging handle for quick manipulations. Specifications Caliber: 6mm ARC Barrel Length: 18 inches Barrel Profile: Government/SOCOM Twist Rate: 1:7.5 Gas System: Rifle length Finish: Nitride/Melonite Handguard: 15-inch M-LOK Weight: Approximately 70 oz Overall Length: 24 inches Why Choose This 6mm ARC Complete Upper? The 6mm ARC cartridge addresses common pain points for AR-15 users frustrated with limited range or excessive recoil in traditional calibers. This upper offers a seamless drop-in solution, compatible with most mil-spec AR-15 lowers, allowing you to achieve sub-MOA accuracy without complex builds. Its robust construction tackles reliability issues in dusty or wet environments, while the efficient gas system minimizes over-gassing for cleaner operation. Whether you're upgrading for precision hunting or benchrest shooting, this upper enhances your setup's versatility, delivering flat trajectories and energy retention that outperform 5.56 NATO at distance-all while maintaining the lightweight, maneuverable profile AR owners love. Ready to elevate your shooting experience? Add the One Horse 18" 6mm ARC Complete Upper to your build today and unlock the full potential of this innovative cartridge for unmatched long-range performance.