Meet the Press's studios are located in Washington DC. This morning on "Meet the Press", David Gregory decided to wave around a 30-round AR-15 magazine.
DC's gun laws:
DC High Capacity Ammunition Magazines -- D.C. Official Code 7-2506.01
Penalties:
It is illegal to possess, sell or transfer any "large capacity ammunition feeding device." A person guilty of this charge can be sentenced to a maximum fine of $1000 and/or up to a year imprisonment. D.C. Criminal Code 7-2506.01.