The Winchester Model 70 Magnum Scope Base features .330" rear hole spacing and an extended front design in a matte finish for optimal optics mounting on Post-64 Winchester Model 70 Magnum rifles.Winchester Model 70 Magnum Scope Base - Post 64 compatibility.330" rear hole spacing for proper fitmentExtended front design for enhanced mounting optionsLow profile design allows iron sight use when optics are removedFull width and depth recoil slots for maximum bearing surfaceSecure mounting with Torx-style T-15 socket cap screwsRecommended torque specification: 25 in/lbEssential for hunters and shooters seeking reliable scope mounting on Winchester Model 70 Magnum rifles providing a stable platform for precision optics while maintaining the option to use factory iron sights.