Glenn brought his Facebook audience behind the scenes between broadcasts to show off a few guns he had displayed on his replica of the Resolute Desk.
"Which one is the most dangerous?" Glenn posed the question to his viewers.
The arsenal included accessorized hunting rifles and even a fully-automatic machine gun (which Glenn called a "piece of crap"). But the scariest weapon on the desk was used in the largest massacre in American history.
Watch Glenn discuss the story behind each gun below.
If you enjoyed watching this, you won't want to miss "Liars or Liberty" presented by Mercury Museum at Glenn's studio in Dallas, August 5-7,2016.
Featured Image: Screen shot from Facebook video