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Yes the 30 round ar-15 mags will work just fine I suggest the MagPul mags https://www.budsgunshop.com/catalog/product_info.php/products_id/712006547/magpul+pmag+m2+moe+magazine+ar-15+223+rem%2f556+nato+30rd

Joshua, there are no differences in the firearms themselves, just the magazine capacity that is supplied with each. Happy shooting Sir!

Joshua, !0 round, 30 round, and this 40 round magazine will fit and function.------https://www.budsgunshop.com/catalog/product_info.php/products_id/714007715/magpul+pmag+m3+223rem+40rd+blk--------------Check out these drums.---------https://www.budsgunshop.com/catalog/product_info.php/products_id/714015211/magpul+pmag+d-60+556+60rd+blk