A 17 round, 9mm extended magazine for the SIG SAUER P320 X-FIVE Legion. These magazines are only compatible with XSeries grips (with and without the magwell). Steel construction featuring Henning Group aluminum basepads. Product Specifications Manufacturer: Sig Sauer Model: P320 X-Five Legion Caliber: 9mm Luger Capacity: 17 Rounds Features: Black steel construction