Warne SIG Sauer P320 Extended Magazine Base Pad 9mm 5-Round Gray 5RD. 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 5-Round Magazine Extension: Manufacturer: Warne Fabric/Material: 6061-T6 Aluminum Finish: Type II Hardcoat Anodized Magazine Capacity: 5 Round Gun Make: SIG Sauer Gun Model: SIG Sauer P320 Projectile Caliber: .355 Caliber Features of Warne SIG Sauer P320 9mm 5-Round Magazine Extension Torx head screw and washer for retention Package Contents: Warne SIG Sauer P320 9mm 5-Round Magazine Extension What firearm models does the manufacturer say Warne SIG Sauer P320 9mm 5-Round Magazine Extension is compatible with? The manufacturer says that Warne SIG Sauer P320 9mm 5-Round Magazine Extension is compatible with SIG Sauer P320Warne 3214-5RD: SIG Sauer P320 Extended Magazine Base Pad 9mm 5-Round Gray