the best primitive sights I've ever encountered are on an original small caliber rifle that I bought years ago. the rear sight has a slight rearward tilt to it, that shades the notch, preventing glare. The notch is a incredibly small round bottomed affair, at the culmination of a very lazy "V" that starts at the outer edges of the sight. This "V" naturally draws your eye to the notch. The face of the sight has been cupped to make the sight notch area as thin as possible, eliminating shadows that give you a false sight picture. The front sight is a very small barley corn, with a blade not over an eighth of an inch high.
When I bought this rifle I glanced at the sights, and declared they were young mans sights. How wrong I was. This is precisely the sight formula Teddy Roosevelt required to be a remarkable marksman in spite of his notoriously poor eyesight.
My Gillespie poorboy has copies of these sights, and I shoot very well with them.
Hungry Horse