NECG (New England Custom Gun) makes replacement front sights for the Ruger. These sights come in several heights and have a larger(3/32")much more visible white bead. I too have 2 Rugers, and liked the beads so well I replaced both. They don't cost much, maybe 9 bucks, takes about 10 minutes to make the switch. On my .416 Rigby I have a 1.5-5 Leupold mounted with Warne Maxima quick release rings...very solid. You might also note that NECG makes a very sturdy aperature sight which clamps to the integral scope bases on the Ruger. It is adjustable for windage and elevation. I have one of these too. It can be used as a primary sight, or carried as a back-up in case of a scope failure.

Geronimo