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The AmeriGlo booth had a Leupold "DeltaPoint" red-dot sight mounted on a LWD Glock slide with backup iron sights made by AmeriGlo:
Note that the rear sight has two holes for adjusting the red-dot sight.
The work was performed by Bowie Tactical Concepts, and can be done to Glocks, S&W M&Ps, and Springfield Armory XDs and XDMs.