Absolutly NOT; they are illegal to anyone in the USA except for law enforcement.
Repeaters
Yes
No
DO NOT SHOOT AMMUNITION IN A WEAPON NOT CHAMBERED FOR IT. If you do, bad things will happen.
Better than 90% of the people who shoot them.
Repeaters
The feature of an AA 12 gun is known as Atchisson Asault Shotgun. It is a combat shotgun that can shoot in either selective fire, semi-automatic or fully automatic shotgun.
yes
You will need to contact the State Department of Natural Resources to find out.
The 5.56/.223 Remington rifles can be. Other calibres cannot be, unless the upper is replaced.
Pretty much any bolt action.
Needs to be examined by a gunsmith.