I just put the laserlyte on my M66 and I think they also fit the judge. I had to make adjustments in the mounting plate holes that attach the laser to the revolver. I could easily adjust left and right to get it centered but the beam was too high and not enough adjustment to bring it down as much as needed. I was able to get it down by altering the mounting holes a little. So far it has held zero perfectly. I read a lot of reviews of users who send them back because not enough adjustment to zero them in. In my case the mounting bracket holes seemed to be a little off.