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This Mark 4 Tactical Mount from Leupold is manufactured from steel, and it's tapped to accept 8-40 or special shouldered 6-48 Torx screws - one set of each size screw is included with the mount. This high-performance mounting solution features a slot-and-spline system for attaching rings - this system is compatible with Leupold's Mark 4, PRW/QRW, and Cross-Slot rings.
This Mark 4 Mounting base features two-piece construction, and it's designed to fit the receiver of a Winchester 70.
Rugged steel construction
Fits Winchester 70
Two-piece mount offers maximum access to breech
Compatible with Mark 4 rings, Cross-Slot rings, QRW/PRW rings
Machined to fit over-sized 8-40 Torx screws and/or special shoulder-type 6-48 Torx screws