The AR is stunningly reliable under what circumstances? Seems to me that it *can* go to several 'unnert rounds between cleanings, at least when being fired off a bench and otherwise not having environmental dust added to the mix.
Then there was the 3-gun match I attended where a Colt HBAR sporter was totally stopped up for more than 15 minutes. It *may* have been a mag problem causing a double feed, but whatever the cause, a round got jammed between the bolt carrier and the rear of the gas tube, above the chamber portion of the barrel.
Betcha the M17s op system doesn't have all those nooks and crannies in the upper receiver for the bullet nose to get jammed in....
Nevertheless, there's probably an AR action in my future. Commonality of parts, etc. From the A1 version forward, the M16 series has proven quite reliable.