There are a variety of fiber optics out there, some good, and some not so good. All help you find that front sight in a hurry. However, those that have a plastic pill or tube mounted on a sight post then to have "blurry" edges to them when you look through your rear sight.
There are some fiber optic sights that are mounted INSIDE a metal tube. The Tube provides a clear edge to the sight, making it much better for hunting, and shooting in general.
It does require a bit of mental adjustment to use these things when you have been shooting a "blade" front sight for many years. The fiber optics, no matter what size, seem HUGE at first. The smaller they are physically, the better the accuracy you will have using them.
The biggest decision you will need to make is the choice of color of the sight. They come in green, yellow, orange, red, and some even in blue. I suggest green, as it seems to be the easiest on my eyes, yet clearly contrasts against both black and white targets, and against the brown coats of deer and other animals. I have not yet found a green in nature that is exactly the same hue as the green on the small optic sights. I have shot Orange optic sights, on my shotgun, and that is how I learned- the hard way--- about " fuzzy " edges. :shocked2: :hmm: :thumbsup: