The Bills have signed linebacker Sam Barrington, safety Bacarri Rambo, and offensive lineman Karim Barton, according to a team announcement. To make room, linebacker Anthony Harrell has been cut and center Patrick Lewis has been waived/injured. 
Barrington spent the first three years of his career with the Packers but was waived before last year’s 53-man cut. The Chiefs claimed him off waivers, but he did not record an official statistic in his two games there and was quickly discarded. In November, he signed with the Saints and finished out the year there. It has been a quiet offseason for Barrington. Before today, the only mention we heard of his name was a May workout for the Jaguars.
Rambo, 27, hooked on with the Dolphins midway through the 2016 season. In nine games (five starts), he recorded 39 total tackles, one interceptions, and three passes defensed.
Barton has bounced around for a few years, being signed to reserve/futures deals by the Browns (2015), Texans (’16) and Titans (’17). The 25-year-old has never played in a game.
The Bills claimed Lewis off waivers from the Seahawks in late August and, in an unorthodox move, signed him to a one-year extension less than two weeks later. Per the terms of that deal, Lewis was slated to earn $1.2MM in 2017.