Sig Sauer Magazine, 357 Sig/40 S&W, 13 Rounds, Fits P250/P320, Steel, Black MAG-MOD-C-43-13 Trusted by military" police and civilians for decades" SIG SAUER has earned a worldwide reputation for the unquestioned accuracy and unflinching reliability of its pistols and rifles. SIG SAUER magazines provide exceptional fit and reliable feeding in their high quality firearms.