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Wiktionary
hoplophobia

n. (context pejorative rare English) The fear of guns.

Wikipedia
Hoplophobia

Hoplophobia is a political neologism coined by retired American military officer Jeff Cooper as a pejorative to describe an "irrational aversion to weapons." It is also used to describe the "fear of firearms" or the "fear of armed citizens." Hoplophobia is a political term and not a recognized medical phobia.