Found this on the net in another comment section (kudos to author):
SUNDAY, DEC 16, 2012 01:31 PM EST
Assault weapons are capable of select fire (fully automatic or burst fire and semi-automatic) operation and are already effectively banned in the US with their possession and ownership limited to holders of a Class III federal firearms license.
The Bushmaster firearm used in Connecticut is not an assault weapon. It's a semi-automatic only (one shot for each pull of the trigger) weapon that is functionally indistinguishable from semi-auto deer/hunting rifles like the Remington 7400 series.
What Feinstein is proposing is a ban on cosmetic styling/appearance. Just as putting a racing stripe on your Ford Mustang does not make it into a race car, styling a firearm to resemble a military firearm does not make it an assault weapon.
People who don't know about firearms shouldn't write about firearms. And legislators who don't understand the difference between styling and function of firearms shouldn't write bad laws based on their ignorance.
Repeat after me until you get it: The Bushmaster .223 is not an assault weapon.