Sig Sauer P320 XTEN striker fired semi auto pistol chambered in 10mm. This pistol features a 5" bull barrel, polymer frame, stainless steel nitron finish optics ready slide compatible with Romero2 and Trijicon RMR, xray3 night sights, all new Xseries 10mm/45 ACP grip module and the flat Xseries trigger with a 90 degree break.