Mags with yellow tape or paint on them are used by persons acting in the capacity of armed escorts - at least in the CF (
reference B-GL-304-002/PT-Z05, Chapter 1, Section 1, Paragraph 11).
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Magazines containing live ammunition will have thier baseplate coloured bright yellow, using permanent non washable paint, or in an emergency, good quality yellow tape. This marking also cannot be concealed in any way.
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