Weaver Mounts 48018 Top Mount Base 18 Black Aluminum Scope Base - Marlin/Remington/Stevens

The Weaver Mounts 48018 Top Mount Base 18 is a precision-machined 1-piece scope base built from aluminum with a classic black finish. Designed in the traditional Weaver-style top mount pattern, this base provides a solid, custom-fit platform for mounting scopes and other optics directly to the receiver of compatible rifles.

Weaver machines each base to tight tolerances so rings seat properly and hold zero under recoil. The single-piece construction delivers maximum strength across the receiver, and the lightweight aluminum build keeps weight to a minimum while resisting corrosion in the field. The base is drilled and tapped to mount directly to the rifle receiver, with rings sold separately so the shooter can choose ring height and style to match their optic and shooting application.

The Top Mount Base 18 is engineered for a specific group of classic American rifles:

• Marlin 88, 89, and 98
• Remington 12A and 121
• Stevens 416

Whether you're restoring a vintage rifle or mounting a new optic on a proven platform, this Weaver base delivers the reliable, time-tested mounting foundation that shooters have trusted for decades.