I have a friend who is looking for something to work well with aging eyes. The sights on his new Marlin 44mag are not cutting it. Any suggestions? He's looking for a large rear peep and a fiber optic front.

I have good luck with the XS Ghost Ring Sights on my Marlin 1894C 357mag lever gun. The white front line sight easily picks up in the Ghost Ring.
https://www.midwayusa.com/product/9...er-700-hole-space-front-base-steel-matte