MCO 3591.2L governs Marine Corps marksmanship competitions and policy and procedures for the Competition in Arms Program.
View MCO 3591.2L on armypubs.army.mil
The publication covers competition formats, officials, eligibility, host commander guidance, awards, competition arms, and ammunition. It includes requirements for training attendance, match administration, weapons security, ammunition handling, and competition reporting.
Civilian competitors and other service personnel are not authorized to compete in the Marine Corps Championship Matches. (paragraph 2)
The use of privately owned weapons for use in the CIAP is authorized except in those matches where prohibited by local rules. (paragraph 5)
Marine Corps units, other than WTBn, are not authorized to disassemble or reload/hand-load match ammunition. (paragraph 6)
Competition badges lost, destroyed, or rendered unfit for use after having been received by the person to whom awarded, can be replaced by purchase only. (paragraph 6)