A weapon with a barrel length of less than 12 inches.
Based on how it fits.
A pistol is a single hand firearm with a short barrel.
Short answer is yes.
"Regular .22 rimfire ammo IS .22 LR.
A shotgun is a firearm. A revolver is a firearm. A pistol is a firearm. A rifle is a firearm. If you want even more specific -- A Remington 1187 is a firearm (shotgun). A Smith and Wesson 686 is a firearm (revolver). A Sig Sauer P226 is a firearm (pistol). A Colt 6920 is a firearm (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.
No, unless it's an NFA tax stamped firearm (short barreled rifles, full auto weapons, etc.)
It means the firearm can fire .22 Short, .22 Long, or .22 Long Rifle cartridges.
No, Sword is not a firearm.
Design of the firearm
Warrior + firearm
yes