Follow along with the video below to see how to install our site as a web app on your home screen.
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I went through this same thing and here is what I figured out.
Even with regular sights on my M&P and my Glock, you can do a really good job of approximating the POI on your target. If it really bugs you you can hunt for taller sights or get a green laser like a Viridian to help you out.