Certain military-grade rifles that are semi-auto but can also be made to fire fully auto are classified as assault weapons, officially and militarily speaking.
Civilian anti-gun activists just call anything "assault" that even looks kind of military, like a black AR-15 that might only fire .22 bullets, one at a time. By the way a .22 bullet might not stop a man unless it's a heart hit; this is why police (and bad guys) tend to use .45 or other larger caliber weapons. A .22 is quieter, less kick, cheaper ammo, and is good for killing rabbits.
Certain military-grade rifles that are semi-auto but can also be made to fire fully auto are classified as assault weapons, officially and militarily speaking.
Civilian anti-gun activists just call anything "assault" that even looks kind of military, like a black AR-15 that might only fire .22 bullets, one at a time. By the way a .22 bullet might not stop a man unless it's a heart hit; this is why police (and bad guys) tend to use .45 or other larger caliber weapons. A .22 is quieter, less kick, cheaper ammo, and is good for killing rabbits.