Bills sign 3 to reserve/future contracts
Also signed on Tuesday were offensive guard Randy Colling and defensive end Kourtnei Brown, who was cut by the Bills before the start of the season.
Allen was selected in the seventh round of the 2011 draft by Baltimore and spent two seasons with the Ravens. He had 19 carries for 69 yards and also played on special teams in 21 games.
Colling was a defensive lineman at Gannon University, where he finished with 25 sacks. The Bills project him to make the switch to guard.
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