Given the popularity of the AR15, surely there must be some compendium of knowledge whereby a feller could get educated as to all the finer points of how an AR15 works. Troubleshooting, tuning, optimizing the system (not accessorizing), torque values where applicable, etc. Something at least as detailed as a Glock Armorers Manual, but explanations of how the system works and parts interact would be appreciated too. An AR15 armorer’s manual for the pedant. A hard copy book, or volume of books, would be preferred but a DVD or even a YouTube series would be okay too. And I ask this understanding that the A answer is, take a class. Fine. But give me a reference that lets me get my pedant on and prepares me for the class. Thanks in advance.