Once you are finally able to remove the factory sights, which are the most difficult factory sights to remove I have had, then getting these into place is likely equally as difficult as they are tight. I actually sanded a bit off the edge because they were not going on. If you have a nice, pricey sight tool, then awesome for you. With the right sight tool this job may be a bit easier, but for the every-day, every-man, get ready to scream, "WTF?" The rear sight was a little easier to install, so you'll have that to look forward to. After you've gotten that bit of nastynous out of the way, once they are on and aligned, they co-witness so perfectly with my Holosun 507c. It's a beautiful marriage with these sights and the Holosun 507c. Once they were on and lined up within the hash marks in the dovetails, I took this to the range and dialed it in. Once you get your sights, both the optic and the iron sights, you'll be putting rounds inside one hole. My particular firearm, the XDM Elite 10mm (3.8"), is a POA sight. Cover the area where you want to place your shot, and it'll go there each and every time. I to have to touch up the finish on my SA Suppressor Height Sights, but that's a cosmetic thing. I'm very happy with the sights, although these should be installed at the factory. Any pistol with an Optic Cut should just leave the factory with suppressory height sights. That's a snivel session for another day. For today, I"m Effin' stoked about my new pistol, sights, and the entire EDC rig. I wish all of you enthusiasts and LE and everything in between the very best, God Bless America, God Bless President Trump, God Bless President Trump, and last, God Bless President Trump. Taking bullets for our Country. I love that man and what he stands for. Please support him in every way. He truly is the answer. Thank you, Mr. President.