Swarovski ATS/STS Integrated Mount (Size 4)

• Eliminates Oversize/Friction Fit Adapters: No need for bulky overmold adapters, providing a clean and streamlined setup.
•  Factory Replacement: Directly replaces the original eye cup for a perfect fit.
• Always Ready to Go: Ensures your optic is always prepared for action.
• Precise and Consistent Alignment: Guarantees accurate and repeatable positioning every time.

https://kapturegear.com/pages/sizing-chart