Weaver’s Top Mount Base #47M (Weaver part no. 48503) is machined from aluminum and finished in black matte, purpose-built for the Winchester 70 A-Bolt/Marlin MR7. As a Weaver-pattern top mount design, it mounts straight to the receiver’s factory screw holes, giving you a Weaver-pattern rail without cutting or fitting anything. Weaver machines the base to tight tolerances for a custom fit against the receiver, and the mounting surface is cut to hold a set of Weaver-style rings securely under recoil. It’s a simple, direct-fit way to get a Winchester 70 A-Bolt/Marlin MR7 ready for a scope.

Key Specifications

• Machined specifically for the Winchester 70 A-Bolt/Marlin MR7, listed as Weaver application #47M.
• Machined from Aluminum for a durable, corrosion-resistant base.
• Finished in Black Matte to match most factory barreled actions.
• Mounts directly to the receiver using the rifle’s factory screw holes.
• Cut to accept Weaver-style scope rings, which are sold separately.
• Built for bolt action rifles, matching this receiver pattern’s action type.
• Machined to tight tolerances for a custom, repeatable fit against the receiver.
• Cut for maximum ring contact area, so rings clamp down securely under recoil.
• Ships at a light 0.0313 lb, adding almost nothing to your order.

Frequently Asked Questions

What rifle does this base fit? It’s machined specifically for the Winchester 70 A-Bolt/Marlin MR7, application #47M on Weaver’s fit chart.

Do I need special rings for this base? Yes, it takes Weaver-style rings, which are sold separately and not included with the base.

Do I need to drill or modify my receiver to install this? No, it bolts directly to the Winchester 70 A-Bolt/Marlin MR7’s factory screw holes with no drilling or gunsmithing required.

Buy the Weaver Top Mount Base #47M, Winchester 70 A-Bolt/Marlin MR7, Black Matte

A rifle without a mounting rail can’t carry a scope, and this Weaver #47M base is a direct, no-gunsmithing way to fix that on a Winchester 70 A-Bolt/Marlin MR7. Order it from our Weaver lineup, part of our full selection of scope bases, from our Lubbock, Texas gun shop, and it ships fast to your door.