Gibbs threw himself into an arms race.
Grab your... guns?
When NCIS traced the death of a Marine back to a gun-smuggling ring, Gibbs knew the only way to take the criminals down would be from the inside. With Abby's expert help, Gibbs transformed into an ex-military arms dealer and headed to an abandoned warehouse for a meeting with a vicious militant group hellbent on taking down the U.S. government.
Watch the explosive exchange go down in "Split Decision" (Episode 21, Season 1 of NCIS).