http://politicalticker.blogs.cnn.co...er-nbc-moderator-violated-law/?iref=allsearch

Ranb
I suppose it could have been a prop or a magazine modified to hold ten or fewer cartridges. Even if he was foolish enough to bring a high cap mag to DC, he is probably smart enough to not say anything to the police without his lawyer present.Washington Metropolitan Police Department is investigating whether NBC’s David Gregory violated D.C. gun laws when he displayed what he described as a 30 round magazine as part of an interview during Sunday’s “Meet the Press.”
“So here’s a magazine for ammunition that carries 30 bullets....."
It’s not known whether the magazine Gregory had in his hand was authentic or a prop. D.C. police spokeswoman Gwen Crump told CNN the department is investigating the matter and would have no further comment at this time.
Ranb