SIG SAUER MPX Gen 1 9mm Pistol Magazine 20 Round. Factory magazine for 9mm MPX. Note: This magazine is designed to work with Generation II MPX or KM models. Specifications for SIG SAUER MPX Gen 1 9mm 20 Round Pistol Magazine: Manufacturer: SIG SAUER Color: Black Caliber: 9mm Luger Gun Make: SIG Sauer Gun Model: SIG Sauer MPX Package Contents: SIG SAUER MPX Gen 1 9mm 20 Round Pistol Magazine SIG SAUER Infinite Guarantee What firearm models does the manufacturer say SIG SAUER MPX Gen 1 9mm 20 Round Pistol Magazine is compatible with? The manufacturer suggests that SIG SAUER MPX Gen 1 9mm 20 Round Pistol Magazine is compatible with SIG Sauer MPXSIG SAUER MAG-MPX-9-20: MPX Gen 1 9mm Pistol Magazine 20 Round