http://us3.campaign-archive2.com/?u=dea97ce680a89a1cfd4c5d52e&id=1acaec5176&e=cd888b3b16
Lee Enfield No.4 Barrel
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 4140/50 chrome moly steel 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.
Model 4NFLD1 features a turned forward shoulder to enable indexing with a lathe. Model 4NFLD-BW features a turned back shoulder and a series of breeching washers, enabling installation without a lathe. CBI Lee Enfield barrels should only be installed and headspaced by a qualified gunsmith.
Please note that although these barrels are still in production, pre-orders may be placed through the below distributors. Orders will be fulfilled in the order that they are received.