Weaver #40A Extended Top Mount Base Matte Finish for Optics
$8.36
- Type:
- Base - Two Piece
- Firearm Make Fit:
- Remington
- Finish-Color:
- Black - Matte
- Misc:
- N/A
- Mount Type:
- To Receiver
- Pieces:
- 1
- Model:
- Top Mount Base
- Material:
- Aluminum
- Rings Included:
- No
The Weaver #40A Extended Top Mount Base is a straightforward, reliable scope mounting solution for hunters and shooters who need to secure optics on rifles, shotguns, or long-range handguns. This matte-finish aluminum base is engineered to fit a broad range of modern and classic rifle models, making it a practical choice whether you're building out a new setup or upgrading legacy firearms. The extended design provides the additional elevation adjustment range some shooters need, particularly those working with longer sight-line distances or specialized shooting applications.
Weaver bases have been a standard in the industry for decades, and the #40A carries that reputation for straightforward functionality. The matte finish resists glare and blends cleanly with most rifle finishes. Because bases work best as a matched pair—one front, one rear—most setups will require ordering two units. Weaver offers this base individually so you can select the exact combination your firearm needs, or look for pre-paired sets if available for your specific rifle model.
Installation and alignment are straightforward if you follow your rifle manufacturer's torque specs and use a quality level. The aluminum construction keeps weight minimal, which matters on rifles where every ounce counts. Whether you're mounting a hunting scope, a tactical optic, or a long-range target sight, the #40A is built to stay put without fuss.
Key Features
- Aluminum construction for lightweight, durable performance
- Matte finish minimizes glare and glint
- Extended design provides additional elevation adjustment range
- Compatible with rifles, shotguns, and long-range handguns across multiple platforms
- Sold individually—order front and rear bases as needed for your setup
Specifications
| Product | Weaver #40A Extended Top Mount Base |
| Material | Aluminum |
| Finish | Matte |
| Mount Type | Top Mount |
| Design | Extended |
| Quantity | Sold individually |
Frequently Asked Questions
Do I need one base or two for my rifle scope?
Scope mounting requires both a front and rear base. The #40A is sold individually, so you'll typically order two—one for the front ring and one for the rear. Weaver does offer pre-paired base sets for some rifle models if you want a matched pair; check compatibility for your specific firearm.
What rifles and shotguns is the #40A compatible with?
The #40A is designed to fit a wide range of modern and older rifle models, as well as shotguns and long-range handguns. Weaver publishes a compatibility chart to help you confirm the right base for your firearm. When in doubt, verify your rifle or shotgun model against that reference before ordering.
Why is the #40A described as an "extended" base?
The extended design provides additional elevation adjustment range compared to standard bases, which is useful for longer-distance shooting or when you need extra vertical adjustment to zero your optic properly.
Is the matte finish just cosmetic?
The matte finish serves a practical purpose: it reduces glare and light reflection that could otherwise catch your eye or create glint that gives away your position. It also blends well with most rifle finishes for a clean, unified appearance.
