Warne SIG Sauer P320 Extended Magazine Base Pad 9mm 3-Round Black 3RD. These extensions feature an ergonomic shape that allows for better insertion and finger grooves allowing the magazine to be stripped from the handgun if needed. Specifications for Warne SIG Sauer P320 9mm Magazine Extension: Manufacturer: Warne Fabric/Material: 6061-T6 Aluminum Finish: Type II Hardcoat Anodized Gun Make: SIG Sauer Gun Model: SIG Sauer P320 Projectile Caliber: .355 Caliber Features of Warne SIG Sauer P320 9mm Magazine Extension Torx head screw and washer for retention Package Contents: Warne SIG Sauer P320 9mm Magazine Extension What firearm models does the manufacturer say Warne SIG Sauer P320 9mm Magazine Extension is compatible with? The manufacturer suggests that Warne SIG Sauer P320 9mm Magazine Extension is compatible with SIG Sauer P320Warne 3206-3RD: SIG Sauer P320 Extended Magazine Base Pad 9mm 3-Round Black