So a traditional 30.06 M1 Garand, or 30 caliber M1 Carbine, are ok, but a semi auto CAR15 with the far smaller .223 caliber is not.
Nothing like a reasoned approach to the CRIMINAL misuse of weapons. (sarcasm)
BZZZZZZT. Not according to these guys they're not. It has nothing to do with a correct definition of an "assault weapon". If you look closely at their list, you'll see a clause for "anything procured for military use".
Your great-grandfather's trapdoor Springfield is an assault weapon to hear these guys tell it.
Check me if I'm wrong, but don't .30 Carbine (feeding the M-1 carbine), .223/5.56mm NATO, and the AK's 7.62x39mm ammunition pack about the same ballistics (roughly)?
All of which come up very short against the 30-06 and .308 (7.62 NATO) "full-sized" .30-cal. rounds, which group energywise with .300 Savage, .303 British, .30-30, .30-40 Krag, and the full-sized Russian 7.62x54R (rimmed).