Ebay is a California owned and operated company. Logic and common sense doesnt apply. I'm curius about your second link where you say it was to a threaded pistol barrel... its a dead link now. In California if your pistol has threads or the ability to accept a silencer (lugs) its an Assault Weapon. There are people paid to search the sport section. They get an alert for every item placed. If they deem the item "ok" they can stop others from flagging it, but if they flag the item its dead right there. This is why the airsoft sellers get away with selling stuff that normal people cant.