Direct replacement barrel for the Lee Enfield No.4 rifle. Criterion replacement barrels are machined to the original contour with a milled front sight and bayonet lug. The No.4 is chambered in .303 British with a 1-10 LH twist rate. Built from gun barrel quality 4150 CMV with a parkerized or “in the white” finish, No.4 replacement barrels come standard with a .010 short chamber and will require finish reaming. All existing models are available in the original military contour.