I picked up a set of weaver mounts for a 3/8 dovetail. If you knock out the pins the rear sight can be gently tapped forward with a plastic mallet. The dove tail underneath works great for 3/8 mounts. I have seen mounts that people get to mount on top of the rear sight base. But this seems much stonger to me. I was able to simply mount my scope right on top. I have also put a pistol style scope on the same way.