In this section, “adjacent state” means Delaware, Pennsylvania, Virginia, or West Virginia. If a resident of this State is eligible to purchase a rifle or shotgun under the laws of an adjacent state, the resident may purchase a rifle or shotgun from a federally licensed gun dealer in the adjacent state. If a resident of an adjacent state is eligible to purchase a rifle or shotgun under the laws of this State, the resident may purchase a rifle or shotgun from a federally licensed gun dealer in this State.