At my club, it gets a little complex.

During the Glock matches, competitors can open carry their sidearm provided the arm is unloaded and the action is open.

During IDPA matches, on the line, the competitor must carry concealed, loading only on command. Off the line, the competitor must carry concealed but unloaded. When entering/exiting the pistol pits, there is a designated station where sidearm must be cased/uncased.

For all practical purposes, unsupervised carry (open or concealed) is discouraged.

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Judge control not gun control!