College Football's Best NFL Factories: Defensive Line - UNC Posted Dec 17, 2017 Ever wonder which college football programs produce the best NFL players by position? We dug through data from the past 15 drafts to find out which schools make the grade at the next level. Best Defensive Line Factory: North Carolina. The Tar Heels have landed six D-linemen in the first round of the NFL Draft, including stars Julius Peppers and Robert Quinn. (ESPN.com)