SIG P211/P320 23-Round Extended Magazine

The SIG Sauer 23-round magazine is the factory-original extended magazine that ships standard with the 23-round P211 GTO competition pistols, and it feeds every 9mm P320 in the lineup: XFIVE, XFULL, XCARRY, FULL, CARRY, and the M17/M18 service pistols. At 23 rounds it carries six more than the standard 17-round full-size magazine and two more than the 21-round extended magazine, the highest factory capacity available for the P320 system in a body that still passes the USPSA box.

The magazine pairs an aluminum baseplate with a polymer sleeve, a layout that adds capacity through length without the flex of an all-polymer extension. The high-visibility orange follower aids reloads and chamber checks, and rear witness holes let you verify round count at a glance. Because it runs the factory spring and follower geometry, feeding reliability matches SIG's standard magazines rather than the variable performance common to aftermarket extensions.

For competition shooters in USPSA Carry Optics or Limited, the 23-round length is engineered to stay inside the 141.25mm gauge, giving maximum capacity per reload without a division-illegal magazine. Duty and range users get the same benefit: more rounds before a reload, full factory warranty, and confirmed fitment across the entire 9mm P320 family.