Weaver Grand Slam Steel Top Mount Base S45 – Matte Black

The Weaver Grand Slam Steel Top Mount Scope Base (Model S45) is a precision-machined, one-piece steel top mount designed to mate with 3/8-inch grooved receivers. Finished in matte black, the S45 is specified as a rear base for Browning Mauser actions and a number of other legacy receivers. Weaver supplies hardened fastening screws and a square-cut notch to engage Weaver detachable rings.

This base is intended for users who need a durable, steel mounting surface and receiver-specific fitment across a range of older and modern actions.

Key Specifications

• Constructed from Steel.
• Finish is Matte Black.
• Manufacturer model number is S45.
• Designed as a 1-Piece base.
• Elevation is set at 0 MOA.
• Style is Weaver-Style Bases.
• Compatibility includes Browning Mauser actions (rear base only) and a range of other listed makes/models.
• Listed model compatibility includes Marlin 455 and Voere 2165.
• Weight is 0.0688.

All-steel construction, precise machining, and hardened fasteners make the S45 a reliable choice for mounting optics on compatible receivers where a rear base is required. The Grand Slam base gives a secure, repeatable platform for Weaver-style detachable rings and an array of legacy rifle actions.