The 49ers Communications staff provided the following rundown.
Long (6-5, 318) was originally drafted by Washington in the third round (78th overall) of the 2014 NFL Draft. Throughout his six-year career with Washington (2014-17), the New York Jets (2018), and Buffalo Bills (2019), he has appeared in 67 games (44 starts) along the offensive line. He has also appeared in two career postseason contests (one start). In 2019 with Buffalo, Long saw action in 14 regular-season games and one postseason contest. He was released by the Bills on August 4, 2020.
A 29-year-old native of Elkhorn, NE, Long attended the University of Nebraska for five years (2009-13), where he started all 33 games in which he appeared for the Cornhuskers.
Barrett (6-2, 250) re-signed with the team on August 2, 2020, after being waived on July 30.