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As a firearms term, primer is related to ammunition. According to gun writer Matthew Boyd, a primer is "a small cap that fits into the rear of the brass. This cap usually contains a highly sensitive explosive that is required to set of the powder inside of a cartridge."[1]

See also


  1. Boyd, Matthew J., "Basic firearms Terminology Defined." Guns and Shooting Online - Chuck, 2012. Accessed February 19, 2015