https://www.cnet.com/news/facebook-wont-show-weapon-accessory-ads-to-people-under-18/

Facebook on Friday said it's updating its advertising policy to prohibit showing ads for weapons accessories to people under the age of 18. 

The social network currently bans ads for the sale of weapons and modifications, like magazines. But Facebook took an additional step of adding an age requirement for ads selling things like holsters, belt accessories or mounted flashlights. The new policy is set to go into effect June 21.