Harrison: Quarterback battles
Elliot Harrison analyzes six hotly contested quarterback competitions for 2012, plus a bonus "battle" on Broadway. More ...
Barron was the 19th overall pick of the St. Louis Rams in 2005 and was a starter for St. Louis through the 2009 season. He spent 2010 with Dallas and was on injured reserve with New Orleans last season.
To clear roster space, Seattle released cornerback London Durham, linebacker Adrian Moten, tackle Jon Opperud and offensive lineman Brent Osborne.
Seattle now has 15 offensive linemen on the team's 90-man roster.
The Associated Press contributed to this story.