The Department of Justice proposes amending the regulations of the Bureau of Alcohol, Tobacco, Firearms, and Explosives (ATF), to codify into regulation certain provisions of Public Law 105-277, Omnibus Consolidated and Emergency Supplemental Appropriations Act, 1999. The proposed rule would amend ATF’s regulations to account for the existing statutory requirement for applicants for firearms dealer licenses to certify that secure gun storage or safety devices will be available at any place where firearms are sold under the license to nonlicensed individuals, and amend definitions of certain terms, including an amended definition of “antique firearm,” to include certain muzzle loading firearms.