I had posted earlier about getting the Ruger No 1 in 40/65. I had some very tall fixed sights that I put on it, and they were still too low, hitting about a foot low at 100 yds. I looked at 3-4 ways of putting a peep sight on it, could not come up with one I liked, the closest I came was putting a plate where the saftey was after removing the button, but not did not like it. I was going thru my peep sight box, and I came across a small box, picked it up and opened it, and inside I found a Smith Enterprises sight, I think, the kind that folds down and has a buckhorn type sight, or you can flip it up, and It has a ladder, with a sliding leaf, with a screw on the side to tighten it up. I had taken it off of a Marlin 38/55, and with a little machining, filing and fitting, it fit tightly inside the dovetail on the No 1 quarter rib. It is exactly the same width and looks good. I estimated where I needed to slide the leaf up the ladder, and tried a shot at 100 yds, it was about 10" high, two more shots and adjustments and I hit my 4x6" clanger 3 times in a row. This was with light bu llet weight, 265 gr ammo that the previous owner said it would not shoot well. Now all I have to do is load up some of the 385 and 400 gr loads and zero. I believe that i can go to 500 yds or more with it, if I can shoot the sights that far. At 500yds we shoot a 18" square clanger, and I figure I will have to center it on top of the front sight, which is tiny but will probably cover it up at that yardage. I will send TBG a pic or two to post for me. It only took me about 20 minutes to get it fitted and zeroed. Some times I over look the simple solutions.