RE: .019-.029 sight pins
depends on the target size....
if your aiming at a larger target, the pins wont cover it as much...
as you get farther the larger the pin, the more target it covers...
also depends on how far your pins are from your eye on how you actually see them...
a good site with good pins, size doesnt seem to effect visibility in low light compared to lower quality pins...
my truglo had .029s...my viper has .019 on top and .010s for the rest...my viper is probably visible longer than the tru glo pins were...and my .019 and .010s fad about the same time..very little difference in light when i loose my .019 compared to .010...but when they fad, its way to dark to shoot...
if your an accuracy freak, .019s or .010s will be a world of difference and will shrink groups...the smaller and finer you can aim, the more precise of a shot you can make...