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Hi Patrick and welcome. This magazine will work in the SAR9 SOCOM no issue. Cheers, stay safe and enjoy!

Hi Patrick, yes sir, this works in the SAR9 SOCUM Stay safe & have a great day!

Hello Patrick, it is compatible with your SAR9. This is a BUDS website so i would obviously recommend their products on here, but if you'll keep your eye out you can often find the 21 round magazines.