Keystone Scope Rings
Keystone Scope Rings represent the flagship of the EGW scope ring lineup. They are 100% American-made and precision CNC-machined at our Quakertown, Pennsylvania facility for shooters who want strength, precise machining, versatile rail compatibility, and straightforward configuration options.
Choose from 1-inch, 30mm, and 34mm tube diameters in multiple heights. Keystone rings are designed for use with Picatinny and Weaver-style cross-slot rails and are sold as a pair.
Shop Keystone Rings Calculate Ring Height
Shop Keystone Scope Rings
First match the rings to your scope's main tube diameter. Then choose the height that provides the necessary objective, barrel, bolt-handle, and scope-cap clearance for your setup.
Why Choose Keystone Scope Rings?
Keystone was developed to provide a strong, precisely machined, American-made scope ring with practical configuration options and compatibility across common cross-slot rail systems.
Precision CNC Machining
Keystone rings are CNC-machined from 6061 aluminum to maintain consistent dimensions and mating surfaces.
Horizontal Split Design
The horizontally split construction provides straightforward scope installation and controlled cap-screw tightening.
Chromoly Crossbolt
A Chromoly crossbolt and 1/2-inch nut secure each ring to the mounting rail.
T15 Torx Cap Screws
T15 Torx cap screws provide positive tool engagement during installation and final tightening.
Matte Black Anodized Finish
The matte black anodized finish provides a clean, durable appearance that complements modern rifle and optic setups.
Manufactured by EGW
Keystone rings are manufactured in the USA at our Quakertown, Pennsylvania facility.
Keystone Scope Ring Specifications
| Available tube diameters | 1-inch, 30mm, and 34mm |
|---|---|
| Ring material | 6061 aluminum |
| Finish | Matte black anodized |
| Rail compatibility | Picatinny and Weaver-style cross-slot rails |
| Crossbolt hardware | Chromoly crossbolt with 1/2-inch nut |
| Ring cap hardware | T15 Torx cap screws |
| Published crossbolt torque | 65 inch-pounds |
| Published ring cap torque | 15 inch-pounds |
| Quantity | Sold as a pair |
| Country of manufacture | USA |
Always review the instructions supplied with your exact rings and the scope manufacturer's maximum torque recommendations before installation.
Choosing the Correct Keystone Ring Height
Select the lowest ring height that provides the required clearance and a comfortable shooting position. Objective-lens size alone cannot guarantee fitment.
Before ordering, account for:
- Scope tube diameter
- Actual outside diameter of the objective bell
- Rail and receiver height
- Barrel diameter and contour
- Scope-cap or lens-cover thickness
- Bolt-handle and action clearance
- Stock or chassis comb height
American-Made From Start to Finish
Keystone Scope Rings are 100% American-made and CNC-machined at EGW's facility in Quakertown, Pennsylvania.
Manufacturing Keystone rings in-house gives EGW direct control over the machining process and allows us to offer consistent configurations across 1-inch, 30mm, and 34mm scope tubes.
Real-World Keystone Ring Testing
An EGW customer tested 1.275-inch Keystone rings on a .50 BMG rifle and shared the complete results with us. The test also demonstrated why the scope's exterior finish, optic weight, installation method, and final torque can affect performance in extreme-recoil applications.
This is documented customer testing, not a blanket fitment guarantee for every .50 BMG rifle and optic combination.
Read the .50 BMG Keystone Field Test ›Scope Ring Resources
Keystone Scope Ring Frequently Asked Questions
What tube diameters are available?
Keystone rings are available for scopes with 1-inch, 30mm, and 34mm main tubes. The ring diameter must match the scope's main tube diameter exactly.
Are Keystone rings sold individually?
No. Keystone scope rings are sold as a pair.
Do Keystone rings fit Picatinny and Weaver rails?
Keystone rings are designed for Picatinny and Weaver-style cross-slot rails. Verify the dimensions and condition of your specific rail before installation.
How do I choose the correct ring height?
Consider the scope's objective-bell outside diameter, rail height, receiver shape, barrel contour, scope-cap thickness, bolt-handle clearance, and stock or chassis comb height. Objective-lens size alone cannot guarantee fitment.
What torque specifications should I use?
EGW publishes a crossbolt torque of 65 inch-pounds and ring cap torque of 15 inch-pounds for Keystone rings. Also follow the scope manufacturer's maximum torque recommendation and the instructions supplied with the exact rings.
Where are Keystone rings manufactured?
Keystone rings are 100% American-made and manufactured by EGW in Quakertown, Pennsylvania.
Build Your Rifle Around Keystone
Select your scope tube diameter, verify the required height, and choose the American-made Keystone configuration that fits your rifle and optic.
Shop Keystone Rings Calculate Ring Height