beefa,
Was that WGRS $23.00 shipped? I have to get one and I don't think you will beat that price of $18.00. They are much more at Williams Gun Sight. I am not sure if you can get away with using the standard front sight or not. If you have your other sights sighted in already, mount the peep and adjust to line up with the standard sights. If you can get it to line up, you should be all set and it will save you the time of getting it on paper. Do you have the plastic sights or the new aluminum Williams Fire Sights? They may be different heights, not sure.