Jones, 24, was a sixth round pick of the New York Giants in the 2011 NFL Draft and played in all 16 games for the team as rookie, starting five, including Week 1. However, he was cut by the team prior to the beginning of the 2012 season. He had workouts with teams, including the Jaguars, prior to signing with the team. He recorded 27 tackles and one fumble recovery in his rookie season.
Armstrong was claimed off waivers by the Jaguars on Oct. 31, but did not play in any of the three games that followed the claim.
After the roster move, the Jaguars now have two Greg Jones's on the roster, which is two more than any team in the NFL. They're winning at something.