One thing that has help me immensely is to degrease your rear sight, mask a 1/16" size "post" in the center of the U or V notch with masking tape and paint a white post there. I used my wife's white fingernail polish. (has to be pure white). I also painted my front bead white. This does two things - it helps with sight alignment, especially in low light and is a good contrast to the target, be it a black dot or deer or whatever.