Radian Weapons Model 1 Complete Upper Features The Radian Weapons Model 1 complete upper is chambered in 6mm ARC and built around an 18 barrel with a 1:7 twist rate tuned to stabilize the cartridge s longer higher-BC bullets for consistent long-range accuracy. Radian s design philosophy centers on using the highest quality raw materials and the most precise CNC machining equipment available resulting in an upper that blends form and function without compromise. Each Model 1 upper is assembled by hand one at a time by a trained gunsmith who inspects test fires and cleans the component to personally guarantee it meets rigid quality standards before shipping. The M-LOK handguard gives shooters flexible mounting positions for lights foregrips and slings without needing to add separate rail sections keeping the profile slim and lightweight. Finished in Flat Dark Earth Cerakote the upper resists wear and corrosion while giving the rifle a distinctive purposeful look that pairs well with a matching lower build. Radian backs every Model 1 product with a lifetime warranty reflecting the confidence the company has in its manufacturing process and quality control. The Radian Weapons Model 1 Complete Upper in 6mm ARC and Flat Dark Earth gives AR-15 builders a precision-grade upper ready to drop onto a compatible lower receiver. Radian Weapons Model 1 Upper Specifications Brand: Radian Weapons Model: Model 1 Type: Complete Upper Caliber: 6mm ARC Barrel Length: 18 Twist Rate: 1:7 Handguard: M-LOK Fit: AR-15 Finish: Cerakote Color: Flat Dark Earth Available At: GrabAGun