I was an infantry platoon leader in the Army, and before that I was in a National Guard Infantry unit. Since getting out I have owned several different ARs, mostly Colt. I have never had a single jam out of any of these rifles that was not related (in the ARs, not the M16s) to the use of steel-case, laquer-coated Russian ammo. IMHO the M16/AR system is very reliable, when factory assembled, and used with good mags and acceptable ammo (that is, anything but Eastern Bloc crap).