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First thing i would check is the adjustable gas block , If you cant adjust it up and make it cycle harder (assuming its not fully adjusted out already) Check gas block position . yes I know its a dumb thing ...The reason i say is that the gas blocks on ar-15 /ar-10 get the hottest ... Aluminum...

I know this is an old topic but I came across it and found that the answers given were not to my liking so I thought i would expound on this issue and relating causes. For ar-10 /ar-15 variants - failure to fires and or non rechambering of ammo . These are all possible issues to check -lose...