Meet Arsenal Attorneys at the Nation's Gun Show this weekend at the Dulles Expo Center in Chantilly, VA. Hours are Friday January 1, 3-8 pm, Saturday January 2, 9am-5pm, and Sunday January 3, 10am-5pm. The show recently expanded, and it is among the largest shows east of the Mississippi River. Visitors to the Dulles Expo should consider a visit to the National Firearms Museum at the nearby headquarters of the National Rifle Association.