Fiber optic front sight

You can file the sight down use a smallish round file at the end to make a trough and then epoxy a piece of weed eater line on the top. Cut the line with a razor blade so it will be nice and bright. Or use a sight tube if you want.

2 colors 4pieces

https://www.ebay.com/itm/183155694064?mkevt=1&mkcid=1&mkrid=711-53200-19255-0&campid=5338765313&toolid=10001&customid=27e489e82aaf5b2163d915671893ead0

or choose the color and diameter for the rod yourself.

https://www.ebay.com/itm/174501577650?hash=item28a11ac3b2:g:RhkAAOSwcAlfnumt