Diamondback Firearms OEM Replacement Barrel Springfield Armory M1A .308 Winchester 13.5in Medium Profile Mid-Length 1-10 Twist 5/8 x 24 Thread 4150. 50in black nitride barrel from Diamondback Made of 4150 CMV with a mid-length gas system. Specifications for Diamondback Firearms OEM Replacement Winchester Springfield Armory M1A Barrel: Manufacturer: Diamondback Firearms Color: Black Nitride Finish: Nitride Caliber: .308 Winchester Barrel Length: 13.5 in Barrel Profile: Medium Gas System Length: Mid Length Threads per Inch: 5/8x24 Barrel Twist Rate: 1-10 Barrel Material: 4150 Chrome Moly Vanadium Gun Make: Diamondback Gun Model: Springfield Armory M1A Length: 13.5 in Package Contents: Diamondback Firearms OEM Replacement Winchester Springfield Armory M1A Barrel What firearm models does the manufacturer say Diamondback Firearms OEM Replacement Winchester Springfield Armory M1A Barrel is compatible with? The manufacturer suggests that Diamondback Firearms OEM Replacement Winchester Springfield Armory M1A Barrel is compatible with Springfield Armory M1ADiamondback Firearms 308M135M50B10: OEM Replacement Barrel Springfield Armory M1A .308 Winchester 13.5in Medium Profile Mid-Length 1-10 Twist 5/8 x 24 Thread 4150 CrMov Black Nitride