Bowers entered the plea Thursday in Queens.
He was arrested at LaGuardia Airport on weapon possession charges in February. Authorities say a handgun was found during a search of his carry-on bag as he prepared to board a U.S. Airways flight to Raleigh, N.C.
Bowers played college football for Clemson University in South Carolina. The Buccaneers selected him in the 2011 NFL draft.