BDM-3

And the screws that mount the Burris FF to the picitinney mount won't screw into the TWS mount. I assume it's the wrong thread pitch, even though nothing in the instructions say to replace the screws. The FF is an older model, but I don't think the mounting has changed miuch on them. Any idea what size screw I need? If not, I will have to remove it and take it in with me. Thanks.

The Google-Fu is showing that mount is thread 8/32 x 5/16.

A few websites show the FF3 comes with M3x6mm or 8mm.

*This is just what I have found, I don’t have a FF3 anymore so I can’t confirm for you*