This video discusses the reliability of Beretta M9A4 magazines, comparing them to OEM Glock magazines. While acknowledging Glock magazines are generally superior, the speaker highlights that Beretta's three main magazine manufacturers (Mec-Gar, Checkmate, and Beretta) produce good quality magazines. Checkmate, as a former OEM for the military contract, has addressed initial issues with phosphate coatings attracting sand, making their current offerings reliable. An anecdote details a Checkmate magazine left in a field for 4.5 days in dew and moisture, showing no rust and functioning perfectly afterward.
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