Tritium pins work.They are pricey.I use .40 yellow for 25yds and up.30,35 and 40 are yellow and green in .19 diameter.Don't use red for hunting anymore..40 pins gather more light than finer pins.Also more fibre length helps.Best pins?,I shoot Toxonics sights but the pins sure do look like Truglo's.Also had good luck with Montana Black Gold pins and sights.They come with a life time warrenty.