“The Colt M4 was extremely reliable. I heard so many people complaining about the reliability of the AR platform; how the weapon has to be cleaned constantly to maintain functionality. I never experienced that. My rifle got used. It got covered in dirt. It kept on chugging out rounds. I cleaned it as and when, but not obsessively and not often. At one point, I was firing from underneath an up-armored 1151, with the rifle flat against the ground, the dust cover inches from the dirt. Zero malfunctions.”
The excerpt above comes from an article posted over at The Truth About Guns. Worth a quick read.