This side mounts bases accept Weaver Side-Mount Rings or Side-Mount Rings Long-Style.

Specifications:

Fits:

- H&R Models 65, 165, 150 &151 (Auto), 250, 251, 264, 265, 365, 450 & 550, 755, 765, 852 & 865
- Krag (offset to left for easy ejection)
- Marl