Pay your money, and take your choice - all replacement front sight blades are approx the same cost, whether they be a F.O. (FireSight, Tru-Gl0, Hi-Viz, etc) in a large or small bead size; an Ivory bead (Lyman, Marbles, Williams, etc) in 1/16" or 3/32"; or a Gold bead (Lyman, Marbles, Williams, etc) in 1/16" or 3/32".
These type sights are generally useful for hunting, and the faster shooting required.
The F.O,'s are very visible for those with poor eyesight and/or those hunting in those pre-dawn & pre-dusk times, and in dark/shaded areas like swamps. They have a tendency to glare in direct/bright sunlight.
GB's are good, but not readily visible under all hunting conditions - and are best if flat-faced or with a flat, angled face - ala sourdough patridge style.
IB's show well in most conditions, unless the shot is a long one over a snow (white) background.
If the front sight selection is for the more deliberate target shooting, ILO hunting, a plain black square post or small bead works best for small groups.
Both MidwayUSA & Brownells offer a nice selection of most all the above front sights.
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