I do the sharpie thing as well. Also do it on my glocks with factory sights. I don't really get thier rear sight design..I have a Beretta PX4 with three dots. Not many aftermarket options, the only ones I would consider are the trijicon hd, but they are expensive to put on a gun I paid $275 for. My first range session I sharpied the rear dots black. I literally can't stand three dots anymore.