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Hi Dan and welcome. This is correct Sir. The 21rd magazine fits as pictured here: https://missouriguns.net/product/sig-sauer-p320-m18-carry-3-9-211-171-9mm-optics-ready-pistol-mpn-320ca-9-m18-ms-upc-798681607556/

Hi Dan, this is correct. The 17rd mag is flush fitting and the 21rd is extended. Self explanatory, no picture needed. Stay safe & have a great day!