Product Description Complete your pistol caliber carbine build with the CMMG 9mm 16.1-Inch Radial Delayed Blowback Barrel Sub-Assembly. Precision-crafted from 4140 chrome-moly steel and finished with a salt bath nitride (SBN) treatment, this barrel delivers outstanding durability, corrosion resistance, and long-lasting performance. The Radial Delayed Blowback operating system features a unique barrel extension engineered to work exclusively with CMMG&';s matching RDB bolt carrier groups, ensuring reliable cycling and consistent accuracy. With a 1:10 twist rate, MT contour, and a 1/2x28 muzzle thread, this barrel is ready to accept a wide range of muzzle devices. Every CMMG product is backed by a Lifetime Quality Guarantee against material and workmanship defects, giving you full confidence in your investment. Product Highlights Radial Delayed Blowback System: Unique barrel extension designed specifically for CMMG RDB bolt carrier groups, ensuring smooth and reliable operation. Premium 4140 Chrome-Moly Steel Construction: Provides exceptional strength and longevity for demanding use. Salt Bath Nitride (SBN) Finish: Maximizes surface hardness, corrosion resistance, and wear resistance throughout the barrel&';s life. 1/2x28 Muzzle Threading: Compatible with a wide variety of muzzle devices including suppressors, compensators, and flash hiders. Lifetime Quality Guarantee: Backed by CMMG&';s commitment to quality against all material and workmanship defects. Specs Brand: CMMG MPN: CMM99DE60A UPC: 810097508453 Caliber: 9mm Operating System: Radial Delayed Blowback Barrel Length: 16.1 inches Barrel Twist: 1:10 Barrel Contour: MT Barrel Material: 4140CM Finish: Salt Bath Nitride (SBN) Muzzle Thread: 1/2 x 28 Gas Port Location: N/A 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.