Ian Rapoport reports guard Chris Williams has signed with the Buffalo BIlls. The report says it's a four-year deal worth $13.5 million with $5.5 million in guarantees, according to a source informed of the player's plans.

The former first-round pick of the Chicago Bears started all 16 games for the Rams last season but struggled as a run-blocker and pass protector. He graded out poorly as the No. 74 player at his position out of 81 entrants in 2013.

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