The Google Shopping policy on Dangerous content will change in June 2018. After the new policy is live, merchants will no longer be able to show ads for parts which enhance the function of a gun. Additionally, the promotion of 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. For more information, look for an update to the Dangerous content policy page when the policy launches in June.
Posted May 2018.