Sig Sauer Magazine, 9MM, 21 Rounds, Fits P320, M17, Steel, Black, Coyote Base MAG-MOD-F-9-21-COY 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.