Product Description The CMMG 30DC30A Barrel Sub-Assembly is engineered for shooters who demand quality when building a custom AR-15 upper group. Chambered in .300 AAC Blackout (7.62x35mm), this 16.1-inch barrel is manufactured from premium 416R stainless steel and finished with a durable bead blast treatment for a clean, corrosion-resistant surface. The medium taper profile keeps weight manageable without sacrificing rigidity, while the carbine length gas system with a 0.75-inch gas journal ensures reliable, consistent cycling. Every barrel sub-assembly ships with a properly installed M4 barrel extension and is fully headspaced at the factory, eliminating guesswork and saving valuable time during your build. Product Highlights Chambered in .300 AAC Blackout (7.62x35mm) for versatile performance across a wide range of projectile weights Built from 416R stainless steel with a bead blasted finish for lasting durability and corrosion resistance 16.1-inch medium taper profile with carbine length gas port and 0.75-inch gas journal for dependable cycling 1:7" twist rate and 5/8-24 threaded muzzle for broad compatibility with suppressors and muzzle devices Includes a properly installed, factory headspaced M4 barrel extension, ready to drop into your upper receiver build Specs Brand: CMMG MPN: 30DC30A UPC: 815835016245 Caliber: .300 AAC Blackout (7.62x35mm) Barrel Length: 16.1 inches Material: 416R Stainless Steel Finish: Bead Blast (Stainless) Profile: Medium Taper Gas System: Carbine Length Gas Journal: 0.75 inches Twist Rate: 1:7" Thread Size: 5/8-24 Compatible With: AR-15 Upper Group 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. ]]>