For any of us who have tried to sell anything firearm related on Ebay, I'd say its a safe bet that you have run into the "Ebay police" , and had your auction cancelled. Its always a little funny to see what people add to their descriptions to avoid the aforementioned cancellation. I recently came across this one for a Webley cleaning rod.
"WW1 Australian Army Pistol cleaning Rod for Webley MK 6 or similar D/I\D marked. Attn: ebay police: this is not a firearm and will not turn into one if water is added. "