NT,
I used this rear sight for my 51 as I couldn't stand the open dovetail. From the looks of the bluing wear on my rifle, it had the older ramp/wedge style rear sight but I couldn't track one of those down so I went with the simple dovetail w/ adjustable elevator. Slid right into the dovetail with just a little persuasion.
http://www.midwayusa.com/product/516164/lyman-rear-folding-leaf-sight-16b-345-high-elevates-to-445
Last edited by 32_20fan; 04/24/13.
