I photographed these M61 Vulcan Gun examples at Eglin AFB and the NMoUSAF.

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M61A1 Vulcan Cannon

NMoUSAF 2018

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M61 Vulcan 20mm Automatic Gun

Air Force Armory Museum; Eglin AFB 2024

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M61 Vulcan 20mm Automatic Gun

Air Force Armory Museum; Eglin AFB 2024