report it missing and pray no one else finds it before you
Whether you even can or not depends on why you lost them.
Never. A felon has lost the right to possess a gun.
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).
No, Sword is not a firearm.
Design of the firearm
Warrior + firearm
yes
No, he cannot have a firearm.
Condition of firearm and how desperate you are.
That depends if you are talking about the firearm or about the cartridge.
I saw a firearm.
Yes, a shotgun is classified as a firearm.