THE FUNDAMENTAL DIFFERENCE

In an overview of the two, USPSA is the most established. It was founded in 1982 as the U.S. branch of the International Practical Shooting Confederation (IPSC), which in turn dates from 1976. IDPA is the new kid on the block, the upstart if you will, founded in 1996.

Both had as their original intent the concept of testing defensive handgun skills in a sporting environment. As USPSA matured, there was an incremental but finally overwhelming shift from self-defense stages to being more "run and gun."