SAN DIEGO—County officials announced proposals Oct. 14 to ban so-called “ghost guns” among other initiatives aimed at stemming gun violence locally. The proposed policies to be voted on next week by the San Diego County Board of Supervisors would call for an ordinance banning the possession or distribution of unserialized parts used to create ghost guns. Ghost guns, also known as “do-it-yourself guns,” are homemade, personally manufactured firearms without serial numbers. They are untraceable due to the lack of identifying markings and therefore can evade state and federal regulations that apply to firearms such as background checks. The proposed measures would also prohibit the 3D printing of unserialized firearms or their parts and would establish safe storage requirements for county gun owners. If the proposed policy passes at the Oct. 19 Board of Supervisors meeting, county staff would also work with community leaders to create preventative gun violence “reduction and …