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Hello All, I am new to this forum, so I apologize if I have asked a question that has already been answered somewhere else. Before asking, though, I spent a few hours searching without success to see if it has been answered already. What parts are the most likely to fail or need replacement on an M4? I would like to know what parts might be a good idea to have on hand ahead of time. As I understand it, the M4 is incredibly reliable and is unlikely to have a failure or need replacements due to wear. I am simply trying to plan ahead. Maybe another good question would be what