5-inch/54-caliber Mark 45 gun

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Invention

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Science and technology

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What Wikipedia says

The 5-inch (127 mm)/54-caliber (Mk 45) lightweight gun is a U.S. naval artillery gun mount consisting of a 5 in (127 mm) L54 Mark 19 gun on the Mark 45 mount.

Excerpt from the Wikipedia article “5-inch/54-caliber Mark 45 gun”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: U.S. Navy photo by Mass Communication Specialist Seaman Apprentice Joshua Adam Nuzzo, Public domain, via Wikimedia Commons.