Product Description Upgrade or replace your build with this Daniel Defense AR-15 barrel chambered in 5.56x45mm NATO with a 10.3 inch length and threaded muzzle. It features a Government profile with a black heavy phosphate exterior and a chrome lined chamber and bore for enhanced wear and corrosion resistance. Built from 4150 chrome moly vanadium steel using a cold hammer forged process, this barrel is designed for durability and consistent performance in hard-use AR platforms. Product Highlights 10.3 inch 5.56x45mm NATO AR-15 barrel, ideal for compact builds Chrome lined chamber and bore for increased longevity and corrosion resistance Black heavy phosphate exterior finish for rugged protection Government contour profile for a balanced blend of handling and durability Cold hammer forged 4150 chrome moly vanadium steel construction Specs Brand: Daniel Defense Manufacturer Part Number: 0707716176018 UPC: 852548002301 Chambering: 5.56x45mm NATO (also commonly listed as .223 Remington/5.56 NATO) Barrel Length: 10.3 in Twist Rate: 1:7 Profile/Contour: Government Material: 4150 Chrome Moly Vanadium steel, cold hammer forged Finish: Black heavy phosphate (Mil-Spec heavy phosphate) Chrome Lined: Yes Muzzle Thread: 1/2x28 Gas System Length: Carbine M4 Feed Ramps: Yes Exterior Diameter at Gas Port: 0.750 in Item Weight: 1.15 lb (listed) Disclaimer: We strive to provide accurate and up-to-date product descriptions, specifications, and images; however, errors or omissions may occasionally occur. We are not responsible for any inaccuracies or discrepancies in the content provided. If you notice anything incorrect or unclear, please contact us so we can correct it. When in doubt, we recommend verifying details directly with the products manufacturer.