Depending on height of your rear blade what you will use.
My rear blade is .146 and front sight is .224. I can neck shoot at 50 and 25 with this.
Someone else might have a different set up on theirs. You will need to measure the rear sight height and go from there.
What you can do is use the .146 rear blade and if you can get the front blade for an N frame revolver(highest you can get), then fit it and adjust height so you can neck shoot at 25,and 50 if you so desire and still shoot point of aim at 7 and 15. Just be careful when you cut the height, keep the top flat and level and do a little at a time. You can always take a little off at a time, but wont be able to put it back on.
Hope this helps.