CMMG Barrel Sub-Assm 16.1in Medium Taper Carbine Length 4140 CM SBN .350 Legend. 1 Barrel chambered in .350 Legend theres no need to worry. Made from 4140CM steel with a nitride finish for superior durability. Works with their Mk4 (AR15) Uppers. Specifications for CMMG .350 Legend 16.1in Barrel Sub-Assm: Manufacturer: CMMG Color: Black Finish: Nitride Fabric/Material: 4140 CM Caliber: .350 Legend Barrel Length: 16 in Barrel Profile: Medium Taper Gas System Length: Carbine Length Gas Block Journal Size-Diameter: .750 in Threads per Inch: 1/2x28 Barrel Twist Rate: 1-16 Flutes: No Gun Make: AR Platform Gun Model: AR-15 Weight: 1.55 lb Additional Features: Threaded Condition: New Dimensions: 1.90 X 1.95 X 17.50 in Package Contents: CMMG .350 Legend 16.1in Barrel Sub-Assm What firearm models does the manufacturer say CMMG .350 Legend 16.1in Barrel Sub-Assm is compatible with? The manufacturer suggests that CMMG .350 Legend 16.1in Barrel Sub-Assm is compatible with AR-15CMMG 35D5F0A: Barrel Sub-Assm 16.1in Medium Taper Carbine Length 4140 CM SBN .350 Legend