I do not own a gun, and never will. What's more, I certainly will never own the M4 Carbine, a military-issued assault rifle, which is illegal in the United States:
"Only government agencies can own and use the Colt M4 Carbine, most notably— the U.S. Military. And for a soldier, that rifle means life or death, so it's the number one concern for soldiers serving in Iraq or Afghanistan today. For a soldier, cleaning and maintaining their issued weapon is always priority, because an unclean rifle can resort in jams, misfires, and other malfunctions."
But despite being a gun novice (and frankly, anti-guns period), I'm fascinated. Robert Xyster's tutorial on M4 Carbine maintenance is a captivating window into an insider military task, as well as a fine example of gun expertise. The instructions are thorough, to say the least.
(Hint: Apparently you can make your own illegal version using an M16 lower receiver and an M4 upper receiver. But the "auto" and "burst" modes are what make it illegal. If you have a lower manufactured before May of 1986, you're good.)
Xyster also states these instructions can be applied to the AR-15 model rifle.
More HowTo's by Xyster: