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This is where I'll give my lecture:

Keep your AR scrupulously clean. You can not get it too clean. Pay particular attention to the chamber and the bolt face. Scrape accumulated carbon out of every little nook and cranny with a dental pick. Thoroughly clean the gas tube as well. There are extra long pipe cleaners available for this purpose. Baring that, liberal use of Carb cleaner will flush the junk out. Unless the inside of it looks brand new, it is not clean enough.

As a Sergeant, I was often tasked to be a range safety during qualification. Every malfunction of an M-16 I ever saw was caused by a dirty weapon. Every one. Some soldiers, whose NCOs had obviously failed them by not training them properly, would have malfunction after malfunction (usually failures to feed) and I would kick them off the range and tell them to clean their weapons because they were out there wasting everyone's time.