Sig Sauer Magazine, 9MM, 10 Rounds, with Henning Group Aluminum Basepad, Fits Sig P320 X-Five Legion, Steel, Black 8900061 A 10-round, 9mm extended magazine for the SIG SAUER P320 X-FIVE LEGION. Steel construction featuring Henning Group Aluminum Basepads. These magazines will function in any P320 Carry, Full-size, and X-FIVE variant with or without the Magwell.