Based on how it fits.
"Regular .22 rimfire ammo IS .22 LR.
It means the firearm can fire .22 Short, .22 Long, or .22 Long Rifle cartridges.
Yes, as long as they are off of parole/probation. Illinois law does not consider a crossbow as a firearm.
No, you cannot use .22 Long Rifle ammunition in an Iver Johnson 55A, as this firearm is designed specifically for .22 Short cartridges. While .22 Long and .22 Long Rifle cartridges are similar, they are longer and may not chamber properly in a gun designed for .22 Short. Always consult the firearm's manual or a knowledgeable gunsmith for proper ammunition specifications.
Consider every gun loaded
A rifle
Yes. However, whether the firearm can feed the .22 short rounds depends on the feed system and action of the firearm. If the .22 LR is fed through a box magazine, the feed system isn't likely to work with .22 short. Lever actions with tubular magazines and breech loaded weapons can typically fire the .22 short, .22 long, and .22 long rifle cartridges. In the case of a semi automatic with a tubular magazine, the .22 short may not produce enough gas pressure to cycle the action. Dependent on the rifle, it may cause short stroking, and could lead to stovepiping, or it could just simply require the action to be worked manually.
Not sure of your question, but a firearm chambered for .22 shorts will not chamber .22 Longs, nor .22 Long rifle cartridges.
If that barrel is less than 16 inches long and you are in the US, you have an illegal firearm.
A weapon with a barrel length of less than 12 inches.
A pistol is a single hand firearm with a short barrel.
Weapon, yes. Firearm, no.