Let's not be so dismissive of "pellet gun". Pellet guns come in various configurations and most are either .177 or .22 caliber. If the muzzle velocity is 495 ft/sec or slower it does not require an FAC/PAL. Those are the ones most people are familiar with. I have two pellet rifles that I use for competition and rodent control - one in .22 cal that has a muzzle velocity of 880 ft/sec and a .177 cal that has a muzzle velocity of 1396 ft/sec. They are both considered very "real" firearms subject to all the rules of real firearms and easily have the potential to kill human beings. There are a large number of these type of pellet rifles around and police are well aware of these rifles and the danger they pose.