SIG Sauer P320 Full Size 9mm Magazine – 21rd


A 21-round extended magazine for the SIG Sauer® P320-M17. The magazine may differ slightly from the image pictured. These are original OEM magazines that come with the M1—made in Italy.

State and regional magazine capacity restrictions apply. Therefore, we cannot ship this item to California, Colorado, Connecticut, Hawaii, Maryland, Massachusetts, New Jersey, New York, Vermont, Washington, Washington, D.C., and Cook County in Illinois.
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P320 21-Round Magazine Fit Guide

The 21-round extended magazine will fit all P320 models, including those with XSeries grip modules with or without the magwell installed. However, the extended length of this magazine will result in it sticking out quite a bit with the Compact and Sub-Compact grip modules.

Additional information

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Black, Coyote

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Many parts sold by Grayguns - including but not limited to triggers, trigger kits, internal components and spring kits - are intended for installation by a qualified armorer or gunsmith who is familiar with the firearm.

Although kits fit with no issues in a great majority of pistols, Grayguns cannot guarantee perfect functionality in every instance.

Due to varying tolerances present in all mass-produced firearms, professional fitting by a qualified armorer who is familiar with the pistol's action may be required.

Grayguns offers installation services for all parts kits we offer. If you have any issues or questions about the installation process, STOP IMMEDIATELY and contact the Grayguns Customer Service Team.