Many Americans can buy a gun in less than an hour. The process takes months in some countries. Here are the basic steps for how most people buy a gun in 15 of them. Many countries have exceptions for specialized professions, and local laws vary. United States 1) Pass an instant background check that considers criminal convictions, domestic violence and immigration status. 2) Buy a gun. Many states have additional buying restrictions, including waiting periods and... (GunPolicy.org)