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Hi Robert and welcome. It can use the M2 or M3. I prefer the Gen 3 Magpuls here : https://www.budsgunshop.com/product_info.php/products_id/1177/magpul+mag557-blk+ar-15+pmag+gen+m3+30rd+.223rem+5.56nato+black

Robert, ask and you shall receive. This uses any standard AR-15 magazine in 5.56/223. Here's a link to spare 30 round Magpul pmags .......................... https://www.budsgunshop.com/product_info.php/products_id/1122/magpul+pmag+m2+moe+magazine+ar-15+.223+rem+5.56+nato+30rd ..................... And if interested here's a link to a 40 round Magpul pmag that will also fit........................... https://www.budsgunshop.com/product_info.php/products_id/1130/magpul+pmag+m3+223rem+40rd+black ..................... Hope this helps and you're very welcome.