Thanks Dennis. I don't need to do any filing to the base of the rear sight do I? Thanks for entertaining my questions. I'm new to this.
You should not need to file the base of the rear sight. Just make sure that the bottom of it is smooth, i.e. no casting/machining spurs etc.
The sight will likely not slide fit in the dovetail that Jim did for you. You will have to open up the dovetail just a small amount. Do it slowly and trial fit as you go. You need a three corner file with a safe-edge for this. Safe edge goes on the bottom, and one file edge opens up one side of the dovetail. Again, go slow and trial fit it often.
If you don't have a three cornered file with a safe edge, you can buy one, or make one out of a three corner file by grinding off the teeth on one edge. I would recommend buying one, that way you know it is flat and true.
You will have to do the same with your front sight. This is the same final operation that is done when you make your own dovetails. Jim has done the hard work for you, but any pre-done dovetail will have to be slightly undersize so that the sight or lug does not slip.
Hope this helps. Just occurred to me that this might be redundant if you have already done underlugs. Can't remember if Jim installs these for you. If redundant, my apologies.
Norm