Ya i have before but that's a little overkill if your going varmet hunting but if its deer its not the best round for deer but you can definitely use it to hunt but idk if its legal... I live in Virginia, and here, it's not legal to hunt deer with anything under .23 caliber (so no .223.) However, ARs can be used in many areas for squirrels, groundhogs, and other varmints. It is faster than most .22 rifles, but hits with more power and reasonable accuracy. Also, if you want, you can buy upper recievers in higher calibers (from .243 to .50 BMG) and hunt with those.
yes
Rifle
No.... You can only hunt with 1 rifle at a time
squirrel
No
yes
shotgun for close range and rifle for long range.
Some states do allow it.
Yes
.243
A felon may not purchase, possess, or have access to firearms in ANY part of the United States.
surf to the state attorney's general webpage for the state in which you want to hunt and read the gun laws. Always read the law for yourself.