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Yes, this will fit & function properly. You may want to just read the reviews at the bottom of the item page.

Hi Philip and welcome back. No Sir. This is an AICS pattern magazine. You need an SR-25 pattern magazine for the S&W AR-10: https://www.budsgunshop.com/product_info.php/products_id/1146/magpul+mag290-blk+ar-10+pmag+gen+m3+10rd+308win+7.62nato+black ------------------- Cheers, stay safe and enjoy!