I saw an AR180 at a gun show one time. Looked closely to see if it was "gold-plated" because of the price-tag. About the M16, I read an article on it that referred to its introduction in Vietnam was initially referred as the "woodchuck wars", mainly because of the much smaller round than the Garand.
Stoner may have been good, but in my research there are much better designers over the years:
Yisrael Galili – designer of the IMI Galil and the Uzi SMG.
Victor Mikhailovich Kalashnikov – Designer of the AK47 & AK74.
But after ALL of my studies, the greatest of all time: John Moses Browning who surpasses them all. His brilliant designs are too numerous to clutter up this fine thread.