The Google Ads policy on Dangerous products or services will be updated in June 2018. After the policy update, ads for parts which enhance the function of a gun will no longer be allowed. Additionally, ads for instructional content about the assembly, enhancement, or acquisition of items covered by our weapons policy—including guides, software or equipment promoted for 3D printing of weapons, ammunition, explosives, and weapon parts—will no longer be allowed.
More details will be available on the Dangerous products or services page when the updated policy launches in June.
(Posted May 2018)