Sig Sauer P320 Magazine, 9mm 30 Round Extended. Constructed from quality steel, this 30-round magazine is designed for the Sig Sauer P320 pistol chambered in 9mm. With a high-tensile magazine spring, this 30-round magazine offers the same reliability as the magazine that shipped with your pistol. Spend less time loading magazines and more time shooting at the range with this factory original extended 30-round P320 magazine. Specifications and Features:30-round capacityHigh-lubricity finish for reliable functionRemovable sleeved base plate for enhanced comfort and functionRear witness holes in increments of 5 to display the remaining rounds in the magazineRemovable base plate for easy maintenanceHigh-tensile spring for unmatched reliability and service lifeDurable polymer followerComplete steel body construction