Faxon Firearms MPI Rifle Barrel 7.62mm/.308 Bore 27in Bull Rifle Length 1/10 Twist Stainless Steel. Crafted from premium 416-R Stainless Steel meticulously honed and fully stress relieved these barrel blanks embody the essence of craftsmanship and excellence. Specifications for Faxon Firearms MPI 7.62mm/.308 Bore Rifle Barrel: Manufacturer: Faxon Firearms Color: Steel Caliber: 7.62x39mm .308 Winchester Barrel Length: 27 in Gas System Length: Rifle Length Barrel Twist Rate: 1-10 Barrel Material: Stainless Steel Gun Make: AR Platform Gun Type: Rifle Package Contents: Faxon Firearms MPI 7.62mm/.308 Bore Rifle Barrel Faxon Firearms PB-B-8-10-27-B: MPI Rifle Barrel 7.62mm/.308 Bore 27in Bull Rifle Length 1/10 Twist Stainless Steel