Product Description The Rosco Manufacturing K9 13.95-inch barrel is built for hard-use AR-15 setups where reliability, balance, and heat management matter. It features a mid-length gas system with an optimized gas port designed to run dependably suppressed and/or unsuppressed. Rosco&&';;s continuous taper profile helps dissipate heat efficiently during sustained firing while shifting weight rearward to improve overall rifle handling when using modern front-end attachments. Finished in a durable nitride coating and made from stainless steel, this barrel also uses an updated target crown (carried over from the Purebred series) for improved harmonics, fit, and finish. Product Highlights Optimized mid-length gas system for reliable function suppressed or unsuppressed Continuous taper contour improves heat dissipation and keeps the rifle better balanced 13.95" length with 1/2x28 muzzle threads for common 5.56 muzzle devices Durable nitride finish on stainless steel for corrosion resistance and long service life Updated target/11-degree crown design for improved harmonics and performance Specs Brand: Rosco Manufacturing Model/Series: K9 (Greenline Tactical) MPN: K9-1395-HY-THEDON-556 UPC: 850039693090 Cartridge: 5.56x45mm NATO Barrel Length: 13.95 in Material: 416R Stainless Steel Finish: Nitride (Black) Contour: Continuous Taper Twist Rate: 1:7 Muzzle Threads: 1/2"-28 Gas System Length: Mid-Length Gas Block Diameter: 0.750 in M4 Feed Ramps: Yes Includes: Mid-length gas tube Compatible With: AR-15 Country of Origin: United States 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 product&&';;s manufacturer.