Just another thing to pop in here, the "buyer protection" scheme that PayPal offered, last I heard is void for airsoft items. Maybe someone can link the thread recently where PayPal confirmed this? I remember reading it here.
Related items that you can buy and sell using PayPal include paintball guns, blank guns, and air-soft guns, as long as such transactions are legal in the applicable jurisdiction. All of these items must display the markings required by law, must not be convertible to shoot a lethal projectile, and can’t include blank ammunition.