SIG SAUER P320 40/357 Full Size 18 Round Pistol Magazine Blued 1 Pack Metal 18RD. Specifications for SIG SAUER P320 40/357 Full Size 18 Round Pistol Magazine: Manufacturer: SIG SAUER Gun Make: SIG Sauer Gun Model: SIG Sauer P320 Caliber: .357 SIG .40 S&W Magazine Capacity: 18 Round Color: Blued Quantity: 1 Fabric/Material: Polymer Package Contents: SIG SAUER P320 40/357 Full Size 18 Round Pistol Magazine SIG SAUER Infinite Guarantee What firearm models does the manufacturer say SIG SAUER P320 40/357 Full Size 18 Round Pistol Magazine is compatible with? The manufacturer says that SIG SAUER P320 40/357 Full Size 18 Round Pistol Magazine is compatible with SIG Sauer P320SIG SAUER MAG-MOD-F-43-18-18RD: P320 40/357 Full Size 18 Round Pistol Magazine Blued 1 Pack Metal