Simply the best - Ameriglo Pro I-dot Set For Glock 20, 21, 29, 30, 31, 32, 36 Front Is ProGlo Green Tritium With Orange Outline Single Dot Green Rear Sight GL-203

I have found two dot systems to be faster acquiring night sights. It allows the eyes to simply vertically align two dots and be on target compared to 3 dot systems which is more illumination for the eyes to be distracted by and more dots of input than is necessary to align sights. The front orange high vis also is incredible for daytime use and allows very fast sight alignment and front site on target acquisition making looking through sites to be very efficient.