The XP One-piece scope rail, a standard in quality that only Tactical Precision Systems can deliver.The XP scope rail features a integral recoil shoulder to eliminate the base from moving under heavy recoil. It has a full length Mil-STD 1913 (Picatinny) rail, built to military specifications, as well as being fully compatible with Weaver-style rings. The entire scope rail is CNC machined, with the same standards and quality as all of the products from TPS.The scope rail is machined from a solid billet of 1215 alloy steel. The steel rail is finished in a matte black oxide finish to Mil-C-13924 standards. The XP bases are supplied with(4) four 6-48Torx® screws and wrench for reliable and trouble-free installation.