Guns that fire their ammunition using the force of compressed gas---BB guns, pellet guns and Airsoft guns---are almost as strictly regulated in Connecticut as more lethal forms of firearms. While the rules regarding possession, transport and discharge of BB guns are slightly less restrictive, they're still governed as if they were conventional firearms.
It is illegal for anyone under the age of 18 to buy a BB gun, though parents are allowed to purchase one and give it to their children. As part of purchasing a gun for a minor, a parent assumes responsibility of properly training the child to use the gun safely. Additionally, minors firing a BB gun are required to be under supervision of an adult while using it.
It is illegal to transport a BB gun unless it is secured in a car trunk or in another similarly locked device. It is illegal to transport BB guns on your person unless in a locked gun case. Improper transportation of BB guns is regulated under the same statutes that govern firearm and other dangerous weapons, and violation of BB gun transportation laws may result in a felony gun conviction or a fine of up to $500. Because of this law, it's also illegal to ship BB guns through the mail or another shipping agency to Connecticut.
Anyone may shoot a BB gun on private property if he has the permission of the land owner to do so, as long as he is only firing at targets located on that private property. Using a BB gun on public land or on private property without the landowner's permission is illegal, and users may be charged with possession of a deadly weapon, a felony charge that may bring a prison sentence of up to three years.
It is illegal to remove, distort or destroy any manufacturer's markings on a BB gun or other firearm in Connecticut. Altering or destroying serial numbers and makers' marks allows prosecutors to assume the weapon was used in committing a crime.