Elite Tactical Systems(R) extended magazine is designed for compatible SIG Sauer P320 pistols chambered in 9mm. The detachable magazine provides a 40-round capacity and features clear polymer construction for visual reference of the remaining ammunition. Its extended configuration provides increased capacity for compatible P320 applications.Key Features Designed for compatible SIG Sauer P320 pistols Designed for 9mm ammunition 40-round capacity Extended magazine configuration Clear polymer construction Transparent body provides visual reference of remaining ammunitionElite Tactical Systems(R) manufactures firearm magazines and accessories for a variety of popular firearm platforms. The company specializes in lightweight polymer magazine designs with an emphasis on durability visibility and dependable function. ETS products are manufactured with attention to compatibility material performance and consistent operation.