Cowboys, Rams complete trade

In a swap of former first-round picks who didn't live up to expectations, the Dallas Cowboys traded linebacker Bobby Carpenter to the St. Louis Rams for tackle Alex Barron, a source said Monday.

Carpenter, the 18th pick of the 2006 draft for the Cowboys, never settled in at inside linebacker in the 3-4 scheme and seemed more suited to play the outside linebacker position in a 4-3 alignment.