Features: 1. Black anodized aircraft grade aluminum 2. Accepts all standard Weaver / Picatinny 1913 accessories 3. No drilling, tapping, or gunsmithing required 4. Mounts to rear sight of models 91/30, M44, M38, M39 & Chinese 53 5. Allows mounting of red dots, reflex sights, holographic sights, long eye relief scopes to standard rifle 6. No modification is required, simply drive out the rear sight pin, mount the rail, and place the screw into the pin hole