Moser played in parts of five NFL seasons between 1978 and 1982 for four different teams, carrying the ball 54 times for 190 yards and one touchdown. He also caught three passes for 10 yards and one score and returned six kickoffs for 108 yards in his professional career. His primary contribution was on special teams where he was ranked #1 on the Steelers in both 1978 & 1979. Moser was a member of two Super Bowl winning teams with the Steelers following the 1978 (Super Bowl XIII) and 1979 (Super Bowl XIV) seasons. In Super Bowl XIV, Moser recorded a Super Bowl record of 5 tackles on kickoff team.