Troopers arrested Reggie Robertson of Byrdstown for carrying an AR-15 as about 100 people gathered to express their concern about the proposals in Washington to limit semiautomatic assault rifles and high-capacity magazines.
"I just feel as an American citizen if I have the right to life, I have the right to defend my life with the best tools available to me," said protestor James Anderson.
According to the Tennessee Highway Patrol, Robertson brought along an AR-15 and also had a magazine clipped onto the rifle and two others on his belt.
While permit holders are allowed to carry handguns on the Plaza, the THP said it's unlawful to carry a loaded rifle in public places.
The man was cited for unlawful carrying and possession of a weapon, which is a misdemeanor.