Just for reference…
Dementia Joe claimed that an AR-15 fires a bullet 5 times faster than any other gun.
The AR-15 is typically chambered in .223.
Muzzle velocity of the.223 is around 3,100 feet per second.
Conversely, a rifle (NOT an AR-15) chambered in .220 Swift has a muzzle velocity of around 4,200 feet per second.
Joe’s math is faulty.