He began shooting competitively in 2003, and became a member of the U.S. National IPSC Revolver team which won the 2005 IPSC Handgun World Shoot in Ecuador. He finished third at the 2006 Summer Blast competition. The next year, he finished second. Finally, in 2008, Walsh finished in first place after beating Mike Carmoney by more than 53 match points.[1]
In 2009, Walsh beat Jerry Miculek for first place in the 2009 USPSA Nationals. This was the first time Miculek was beat at the Revolver Division.[2][3] Walsh is also the fourth person to receive the USPSA revolver Grand Master classification.
In 2011, Walsh appeared in the third season of History Channel's marksmen competition Top Shot. During the first half of the competition, Walsh competed as part of the Red Team. His team ended up winning three challenges during his tenure, and Cliff was nominated for elimination three times. He was eliminated during the eighth week of the competition in a competition with a bow.