Gun manufacturers were betting that a Hillary Clinton victory would lead to a surge in gun sales, as often is the case when pro-gun control candidates win high-profile elections. Donald Trump's surprise victory put gun owners at ease, but also shot a hole in the sector's profits.
Source: Money.net
Michelle Leder of Footnoted points out that companies like Sturm Ruger & Company Inc and American Outdoor Brands Corporation, (formerly known as Smith & Wesson), saw their numbers plummet after the election. Strum, for instance, reported that the number of background checks they performed for gun purchases fell 24% in January from a year earlier — and that's after brisk sales leading up to November.