https://www.theverge.com/2018/6/17/17470578/facebook-ads-gun-accessories-minors

Facebook will soon prevent minors from viewing ads for gun accessories such as holsters, or magazines. The move comes amidst renewed focus on gun violence in the United States following school shootings in Santa Fe, Texas, Parkland, Florida, and others.

According to a Facebook spokesperson, the company already bans ads for guns and modifications, but sellers can post ads for accessories such as gun-mounted flashlights, scopes, holsters, gun cases, gun paint, or slings. The company isn’t going to prohibit those ads, but it will require sellers to “restrict their audiences to at least 18 years of age or over.”