Here is something strange, once I removed the front sight post out of the sight picture, I ordered a Ruger factory fold-down front sight to match the one that came on the back of the rifle.
Dang thing doesn't have a blade-stop spring loaded detent pin!
At first I thought maybe somebody forgot to put it in place, but it doesn't even have the hole to accommodate a spring loaded detent.
Figured out that I could just add a certain number of thin shim washers to set the elevation and then tighten the blade down on them, but I liked where it sits without any shims at all so I left it there.
It was only after I received the sight that I read the reviews and everybody was commenting on the lack of that detent.
Heck the sights are for back-up use anyway, so they stay folded down normally.