I make my own,one of the reasons is age being close to 70 my eyes don't work like they use to. I use a 180 dia. hole in a sheild about half the dia. of a normal peep sheildand a fine wire suspended dioade in a .580 tube.It works for me since I don't like to put scopes on a Hawken I built as a copy of an original.[If you happen to be in a state that won't allow electronics you could adapt one of the new light gathering front sights for shotguns.
Mine works as long as there is light enough to see the target. Lee