Take note that if you buy “NATO” or “military” brass (specifically for 5.fifty six)…you’re going to must do some additional case prep since they use crimped primers that don’t easily allow you to re-key them without having making the primer pocket greater. I’m all for details on the net, but https://florahadi.com/%D8%AA%D9%87%D9%8A%D9%87-%D9%83%D8%B1%D9%87-%D8%A8%D8%A7%D8%AF%D8%A7%D9%85-%D8%B2%D9%85%D9%8A%D9%86%DB%8C-%D8%AE%D8%A7%D9%86%DA%AF%DB%8C/