Would anyone know what the factory thread for the front bead is on a 2000e model, and 1990ca. 201e, o/u merkels?? thanks

yobyllib,
If you can't find the standard pitch in either the EAW or ERA catalog ( on line), New England Custom Guns can likely help. You may find it is a US standard, they use 6-48 in mounts as we do.
Mike

Do you have a bead that you want to replace or is the bead missing?

thanks, i am a machinist per se , so i can figure it out with gages etc , Im sure its metric first off.Ime replacing with fiber optic,just checking if anyone been down this road, as i know for example a perazzi bead thread is identical to the beretta thread in the timeline.