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Shares of gunmakers were rising in trading Monday following a pair of mass shootings in Dayton, Ohio, and El Paso, Texas, over the weekend. 

Gun sales tend to spike following these U.S. mass shootings as gun owners recognize the pressure from renewed calls for tougher gun control laws.

There have been about 250 mass shootings in the country year to date, according to certain data.

Investors also are aware of the trend: As the mass shootings get more coverage, shares of the gunmakers rise. 

Monday was no different. 

Vista Outdoor (VSTO - Get Report) was up 1.63% to $7.50, while American Outdoor Brands (AOBC - Get Report) was up 5.32% to $9.10. Sturm Ruger rose 3.3% to $47.37.

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