Maglite XL50 flashlight clip for gun sight rail

My son and his friends like to shoot at each other with air-soft guns, including day and night battles. For the night battles my son wanted to mount a flashlight on his gun, so we spent about 20 minutes designing this clip on sketchup.
This clip will hold a Maglite XL-50 LED flashlight on any MIL-STD-1913 sight rail. The clip grabs the rail tightly and doesn't slide without applying a lot of force, and it holds the flashlight with a tight grip as well.