Kolb was an Arizona Cardinal the past two seasons. The 28-year-old is a six-year veteran.
According to Buffalobills.com, Kolb has never played a full 16-game season in his career. This is in part of the fact he's always served as a backup, or was injured. He took over for injured QB John Skelton last season in Arizona.
Kolb will now be competing for the Bills' starting QB against Tavaris Jackson and Aaron Corp.
Terms of the deals were not disclosed per team policy.
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