The Weaver #S46 Grand Slam top mount rifle scope base is a steel mounting solution built to handle the recoil and abuse of serious hunting and range shooting. This front base fits a broad range of rifle platforms—from Winchester Model 70s to Savage 110s to Marlin MR-7s and beyond—making it an accessible way to mount quality optics on classic and modern actions alike. Whether you're building a long-range rig, upgrading a family rifle, or working with a less common platform, the S46 is engineered to lock your scope down reliably without fuss.
Like all Weaver bases, the S46 is manufactured from hardened steel and finished in matte to eliminate glare. The design is straightforward: engineered for precision fit on rifles where the receiver profile matches Weaver's specifications, it provides a solid, repeatable platform for scope rings. The matte finish resists reflection and corrosion, and the base itself is made to last through seasons of hunting or thousands of rounds at the range. This is the front base only—you'll need to confirm the matching rear base for your specific rifle platform (compatibility varies by action type and receiver design).
Weaver bases have been the standard in American hunting and shooting for decades because they work. No marketing flourish needed: a steel base that fits, a matte finish that doesn't shine, and compatibility with countless popular rifles. If your rifle is on the compatibility list and you're tired of improvised solutions or rings that won't hold zero, the S46 delivers the straightforward mounting security hunters and shooters have relied on for generations.
| Base Type | Front Mount |
| Material | Steel |
| Finish | Matte |
| Manufacturer | Weaver |
| Model | S46 |
The S46 is a front base compatible with numerous rifle platforms including Winchester Model 70 (long and short action with H&H magazines above serial #1,896,476), Savage 110/116/10/11/12, Marlin MR-7, Browning BBR, Cooey 71, Enfield variants, H&R 300/301, Herter's J-9, Mauser variants, Musgrave Mark models, Parker Hale rifles, Sears 53, and many others. Check the detailed compatibility list to confirm your specific rifle model and action type before ordering.
Yes. The S46 is a front base only. You will need to purchase the correct matching rear base for your rifle platform separately. Rear base models vary by action type, receiver design, and whether your rifle has standard or extension rails, so verify compatibility for both front and rear before your purchase.
The S46 front base is designed for standard receiver profiles. Some rifles have extension rails (marked as F/extension or R/extension in compatibility charts), which may require a different base model. Confirm your rifle's exact configuration—standard or extended—before ordering.
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