caliber limitations are set by the hunting ministry in your region, eg 243 for deer(smallest) 22lr for smll game eg rabbits and so on
South Dakota defines legal firearms in terms of muzzle energy, not caliber. See the link below.
Yes, they are legal in the state of Illinois.
Every stunts should be legal in Illinois.
No. Riding in the back of a truck is NOT legal in Illinois.
The probability of it being legal is quite high, seeing as Airsoft is legal in the state of Illinois.
No they are not street legal.
No
Yes
Yes.
No, studded tires are not legal in Illinois.
Yes, 151 is popular here in Illinois.