From the Nasty Icons pack by Vincent Le Moign / Streamline · CC BY 4.0 · added 26 August 2018
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Gun Turret icon by Vincent Le Moign / Streamline (https://www.streamlinehq.com/icons/nasty-icons), licensed under CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/), via IconVulture
