I photographed these M45 Quad Gun Mount examples at Arlington, Ft Belvoir and Oshkosh.

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M45 Quad Gun Mount

Military Veterans Museum, Oshkosh 2024

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M45 Quad Gun Mount on M20 Trailer

This combination was labeled the M55 Machine Gun Trailer Mount

Arlington 2022

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M45 Quad Gun Mount

US Army Museum 2026