I have three guns with front night sight only and three other with both front and rear. I prefer having both front and rear night sights. I have Trijicon green front and rear on two pistols and Meprolight green front and rear on another. I prefer all green to different colors as I want my sight picture to be as similar as possible night and day. My three guns with front night sights only have XS Big Dot sights and they were not available with rear night sights. They work well but I would have liked rear night on them too.