Falling-block action

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Notion

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Science and technology

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What Wikipedia says

A falling-block action (also known as a sliding-block or dropping-block action) is a single-shot firearm action in which a solid metal breechblock slides vertically in grooves cut into the breech of the weapon and is actuated by a lever.

Excerpt from the Wikipedia article “Falling-block action”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: DL24, Public domain, via Wikimedia Commons.