The Weaver Top Mount Base #402M (Weaver part no. 48429) is a black matte aluminum scope base machined specifically for the High Standard/Marlin 455/MR7, giving the action a Weaver-pattern mounting surface for a set of rings. Weaver machines each base to tight tolerances so it seats on the receiver with a true, repeatable fit, then finishes it in black matte to match most factory barreled actions. Built as a 2-piece base, it bolts directly to the receiver using the rifle’s factory screw holes, no drilling or gunsmithing required. It’s a straightforward way to add optics to a High Standard/Marlin 455/MR7 that didn’t ship drilled and tapped for a proprietary mount.

Key Specifications

• Machined specifically for the High Standard/Marlin 455/MR7, listed as Weaver application #402M.
• Built as a 2-piece base, matching that mounting style to the receiver.
• 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.
• 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 0.05 lb, adding almost nothing to your order.

Frequently Asked Questions

Will this work on other rifles besides the High Standard/Marlin 455/MR7? No, Weaver machines each application number to one specific receiver pattern; this is application #402M, built for the High Standard/Marlin 455/MR7.

Are scope rings included? No, this is the base only; pick up a set of Weaver-style rings separately to complete the mount.

Is installation difficult? No, the base uses the rifle’s existing factory screw holes, so it’s a direct bolt-on installation.

Buy the Weaver Top Mount Base #402M, High Standard/Marlin 455/MR7, Black Matte

Getting glass onto a High Standard/Marlin 455/MR7 starts with a solid base, and Weaver machines this one to seat true and hold zero under recoil. 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.