David Gregory's show prop

It seems DC police are at least going through the motions of investigating what was in David Gregory's hand during last Sunday's Meet the Press program. The Washington Post reports:

In asking his guest on the NBC show whether high-capacity ammunition magazines should be banned, Gregory held an object in his hand and said it was a magazine that could hold 30 bullets. 

In its firearms regulations, the The D.C. Code stipulates that “No person in the District shall possess, sell, or transfer any large capacity ammunition feeding device” whether or not it is attached to a firearm.

Is there any chance a star correspondent like Mr. Gregory, at the thick of his network's coverage of government and gun control, could be so woefully uninformed about the gun laws in the city where he works? Who had the idea of flaunting the magazine? Who actually brought it into the studio? Was it real? Or did Gregory fib to his viewers?

So many questions to be answered here.

I'm also curious if authorities in Colorado have begun an inquiry into claims recently made by a news anchor at another network.