The EGW Winchester 70 scope base is a one-piece Picatinny rail system designed for Winchester Model 70 long-action rifles. If you're running iron sights or an older scope setup on a 70, this base gives you a rock-solid platform for modern optics without drilling or tapping your receiver. It's precision-machined aluminum that threads into your rifle's factory scope mount holes (the ones with .860 spacing on front and rear rings) and accepts any standard Picatinny or Weaver scope rings, so you're not locked into one ring system or locked down on eye relief adjustments.
EGW machines this from 7075 T6 aluminum—the same alloy used in aerospace and high-performance applications—and machines the Picatinny slots to MIL-STD 1913 spec, which means your rings will fit tight and repeatable. The heavy-duty variant is engineered .100 inch lower than the lightweight version, keeping your scope axis closer to the barrel for potentially tighter groups and a lower cheekweld. That's a real advantage if you're chasing precision at distance or building a hunting rifle that needs to be honest-to-goodness fast and accurate.
Installation is straightforward: screws into existing holes, no gunsmithing needed. The kit includes socket head Torx screws and a wrench, and EGW specs 20 inch-pounds of torque with a small dab of blue Loctite to keep things locked in. If you've got a Winchester 70 long action and want the flexibility to swap optics, dial in your eye relief, and build on a platform that won't move, this base delivers that without a visit to a smith.
Key Features
- Precision one-piece Picatinny rail—no drilling, no tapping required
- Drilled for Winchester Model 70 long-action factory scope mount holes (.860 spacing)
- Heavy-duty construction in 7075 T6 aluminum for maximum rigidity
- Accepts any Picatinny or Weaver scope rings for maximum flexibility
- Slots machined to MIL-STD 1913 spec (±.002 inch tolerance)
- .100 inch lower profile vs. lightweight version—closer to barrel axis
- Includes socket head Torx screws, wrench, and torque specs
Specifications
| Material | 7075 T6 extruded aluminum |
| Mounting | Winchester Model 70 long-action factory holes (.860 spacing front and rear) |
| Rail Standard | MIL-STD 1913 Picatinny |
| Ring Compatibility | Picatinny or Weaver scope rings |
| Profile Type | Heavy-duty (reduced height vs. lightweight) |
| Slot Tolerance | ±.002 inch |
| Recommended Torque | 20 inch-pounds |
| Fasteners | Socket head Torx screws with wrench included |
Frequently Asked Questions
Will this fit my Winchester Model 70?
Yes—this base is drilled specifically for Winchester Model 70 long-action rifles with .860 inch spacing on the front and rear receiver rings. If you have a Model 70 short action or a different receiver design, verify your hole spacing before ordering.
What scope rings do I need?
Any rings with Picatinny (MIL-STD 1913) or Weaver dovetail will work. That flexibility means you can choose rings based on bore size, height, and your preferred locking mechanism, then swap them later without replacing the base.
What's included in the kit?
The base comes with socket head Torx screws and a wrench. EGW recommends 20 inch-pounds of torque and a small amount of blue Loctite to secure the fasteners; these are not included and should be sourced separately if you don't have them on hand.
Why is the heavy-duty version lower than the lightweight?
The .100 inch lower profile brings your optic axis closer to the barrel centerline. This can improve accuracy by reducing bullet rise and giving you a faster, more natural cheekweld—especially valuable for precision hunting or long-range shooting.
