Is it an actual projectile or is it a cartridge? The main parts of a cartridge are the case, the primer, the charge and the bullet; a cartridge goes into a gun, a bullet comes out of a gun.
Knives are more regulated than guns, also so with, “It shall be unlawful for any person willfully and intentionally to carry concealed about his person any bowie knife, dirk, dagger, slung shot, loaded cane, metallic knuckles, razor, shurikin, stun gun, or other deadly weapon of like kind….” North Carolina state law.
I have a lock back pocketknife with a 3 3/8-inch blade, which makes it legal in Raleigh, but illegal in Cary (3 inch or less).
That’s why they wallow.