Brownells - Federal 5.56x45mm XM855F 62gr 500 Round Case
This video showcases the 5.56x45mm XM855F 62gr 500 Round Case by Federal.
WARNING: Never attempt to disassemble or reassemble a firearm unless you are absolutely certain that it is empty and unloaded. Visually inspect the chamber, the magazine and firing mechanism to be absolutely certain that no ammunition remains in the firearm. Disassembly and reassembly should follow the manufacturer’s instructions.