Simple install - AmeriGlo Tall Serrated Height Set

No fitting was necessary for mine. I used a sight pusher and the rear sight slid in with no issues. I mounted a Primary Arms SLX RS-10 on my G40 using the PA supplied mounting plate. I decided to use the Glock supplied #5 plate instead to raise the RD a little which gave me about 1/3 cowitness. The bottom of the rear sight notch is slightly above the body of the RD. I had wanted the next height down but OP didn't have any available that I saw in plain black. The 2XL height will work just fine. Plain black is definitely the way to go, I can see why it's what most people prefer. The front sight really stands up in the RD window, if it had a dot on it I think it would be very distracting.