CMMG 300BLK Non-Threaded Barrel 16.1in Empire Profile 4140CM SBN Sub-Assm Black. 1" Empire Profile barrel sub-assembly is engineered for 300 Blackout featuring a medium-taper design crafted from 4140 Chrome-Moly steel with a durable Salt Bath Nitride (SBN) finish. The barrel incorporates an unthreaded muzzle with a recessed target crown. This configuration was specifically developed to provide a reliable option for areas with specific firearm regulations while maintaining CMMG's standards for accuracy and durability. Specifications for CMMG .300 BLK Non-Threaded Barrel: Manufacturer: CMMG Color: Black Finish: Anodized Caliber: .300 AAC Blackout Barrel Length: 16.1 in Barrel Material: 4140 Chrome Moly Vanadium Features of CMMG .300 BLK Non-Threaded Barrel 16.1" barrel length 300 Blackout chambering 4140CM steel construction Salt Bath Nitride finish Unthreaded muzzle design Recessed target crown Medium taper Empire Profile Package Contents: CMMG .300 BLK Non-Threaded Barrel CMMG 30D510A: 300BLK Non-Threaded Barrel 16.1in Empire Profile 4140CM SBN Sub-Assm Black