Eugene Stoner (a former WWII Marine) died in 1997 from Cancer.
His AR15 was originally developed for the 7.72 NATO round (the AR10) Also his AR18 or AR180 and the Stoner 63 were all originally chambered for 7.62 NATO before he came out with an identical design for the 5.56 Nato round.
Eugene Stoner was bright and innovative. The AR15/M16 was NOT his best design...(that would be reserved for the Stoner 63 system and the AR180 which were improvements over the AR15 design.)
Stoner was a good designer...perhaps as good as John Garand. Certainly a better designer than Garand when it came to innovative designs..though not as good when it came to reliability.
And of course John Moses Browning (father of the Browning M2 Machinegun, BAR, 1911, 1892 Winchester Repeating Rifle, Browning Auto 5 shotgun, Winchester Model 1897 Shotgun, Browning Hi Power, etc etc. [the list is too long for me to write])
stood head and shoulders above Garand, Stoner, Kalashnikov, Gaston Glock, Simonov, etc.
I wonder what kind of Rifle Browning would build if he were alive today ?