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I have had good luck with Magtech https://www.budsgunshop.com/catalog/product_info.php/cPath/656_2081_10000601/products_id/712014968/MAGTECH%20M193%205.56%2055GR%20FMJ%201000RDS%20PER%20M2A1%20CAN/

True, anything lacquer coated will start gumming after the chamber gets hot. This quality a weapon should only see brass cased ammo. Race car, race gas and not regular test. This will eat anything brass. I would not put any steel cased fodder through this weapon.