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The firearm involved in the incident was a .44-caliber cap and ball revolver, a black powder gun that uses a lead ball and percussion caps.—
Caleb Lunetta,
San Diego Union-Tribune,
12 Feb. 2026 One of the revolver’s chambers was empty, and officers found an expended percussion cap.—Los Angeles Times,
28 Jan. 2022 Oxygen generators use a chemical reaction initiated by a percussion cap.—
John Cox,
USA TODAY,
4 Dec. 2020