They are showing off a gun-mount that can shoot around corners. Apparently it has some kind of little camera so you can see where the mounted Glock is pointing.

So the maker of the product steps in front of the camera...with the glock still mounted. And then he moves so the main guy can show how the camera can move around.

Great job standing in front of a real gun with a guy who is just learning about the weapon...

http://www.ar15.com/forums/topic.html?b=1&f=5&t=532604