.080" is not too wide for me on a 42" barrel, but if you need a thinner sight, .060" looks a lot thinner than .080. Again, I'm talking about on a 42" barrel. White brass would show up a lot better than iron but I've found that its mainly useful for deer hunting where the shots are primarily 20 minutes after sundown in the evenings or just at first light. Squirrels would be seen in pretty good light most of the time, so If you're satisfied with a brown or black iron sight for deer, that should be fine for squirrels too.