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Hi Luey, Yes it will fit without issues. Congrats on the new sig, you'll love it!

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yes it will but so would any other ar15 style mag I would suggest the p-mags at a lot better price 20 round https://www.budsgunshop.com/catalog/product_info.php/cPath/26_27/products_id/714006774/Magpul®+MAG560-BLK+AR-15+PMAG®+GEN+M3+20RD+223REM%2F5.56NATO+Black 30 round https://www.budsgunshop.com/catalog/product_info.php/cPath/26_27/products_id/712006547/Magpul+PMAG+M2+MOE+Magazine+AR-15+.223+Rem%2F5.56+NATO+30RD