30-round capacity High-lubricity finish for reliable function Removable sleeved base plate for enhanced comfort and function Rear witness holes in increments of 5 to display the remaining rounds in the magazine Removable base plate for easy maintenance High-tensile spring for unmatched reliability and service life Durable polymer follower Complete steel body construction Shoot longer between reloads with this reliable factory 9mm P320 30-round extended magazine. Unlike other extended magazines, this 30-rd mag offers the same reliability as the magazine that shipped with your pistol. Also included is a removable sleeve for enhanced comfort when used in a full-size grip module.