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FOR SALE: GUNBROKER.COM OLD POST 06-22-2011 Paypal & email info below [email protected] http://www.gunbroker.com/Auction/ViewItem.aspx?Item=239875293.

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 have other forum M4 owners experienced as far as part replacement needs? Has anyone had any parts fail or wear out and need replacement? Thanks to everyone for your help!