KANSAS CITY, Mo. (AP) The Kansas City Chiefs have signed four free agents with minimal NFL playing experience to two-year contracts. They are fullback Steven Jackson, wide receiver Kevin McMahan, offensive tackle Ken Shackleford and linebacker E.J. Kuale. Only one of the four has suited up for regular season duty. Jackson was active for two games with the Carolina Panthers in 2006. Three of the signings are at positions where the Chiefs lack depth and experience on offense. McMahan is a former seventh-round pick of the Oakland Raiders and spent part of the 2007 season on Kansas City's practice squad.