So i was wanting to try a red dot on my pistol. Figure id start cheap and if i liked it, id buy a nice one... once i killed the cheapy. I bought a ade sight off Amazon for around 40 bucks shipped. I installed it on my glock 22 with 9mm barrel on rear of slide. It worked pretty good but i decided i wanted to use my xdm competition 9mm instead of glock. Im just more comfortable with it because i use same gun in 40 for uspsa in limited. Anyway i took staight off my glock and stuck right on my xdm. Took it outside to sight it in. It was only 1/2" to right off. I didnt even readjust it. I quickly put 16 rounds though the head of a uspsa target. I was so happy i figured i should share. By the way ive shot couple hundred rounds now and that cheap ass sight is still dead nuts.