Diamondback Firearms OEM Replacement Barrel Springfield Armory M1A .308 Winchester 18in Medium Profile Rifle-Length 1-10 Twist 5/8 x 24 Thread CrMov. Made of 4150 CMV with a rifle-length gas system. Specifications for Diamondback Firearms OEM Replacement .308 Winchester Rifle-Length Medium Profile Barrel: Manufacturer: Diamondback Firearms Color: Black Nitride Finish: Nitride Caliber: .308 Winchester Barrel Length: 18 in Barrel Profile: Medium Gas System Length: Rifle Length Threads per Inch: 5/8x24 Barrel Twist Rate: 1-10 Barrel Material: 4150 CMV Steel Gun Make: Diamondback Gun Model: Springfield Armory M1A Condition: New Length: 18 in Package Contents: Diamondback Firearms OEM Replacement .308 Winchester Rifle-Length Medium Profile Barrel What firearm models does the manufacturer say Diamondback Firearms OEM Replacement .308 Winchester Rifle-Length Medium Profile Barrel is compatible with? The manufacturer suggests that Diamondback Firearms OEM Replacement .308 Winchester Rifle-Length Medium Profile Barrel is compatible with Springfield Armory M1ADiamondback Firearms 308R18M50B10R: OEM Replacement Barrel Springfield Armory M1A .308 Winchester 18in Medium Profile Rifle-Length 1-10 Twist 5/8 x 24 Thread CrMov Black Nitride