Why do I receive a warning regarding weapons etc. for an item I try to list which is not a weapon?

[frits959]

I try to list a night vision helmet  mount as it is no longer needed, but I get a warning regarding selling weapons and ammunition. The item is defenitely not a weapon. Any suggestions

[kopenhagen5 · Accepted solution]

Probably a prohibited item which has no category but falls under this one.

Is it for gaming or a real one?

Prohibited - http://pages.ebay.com.au/help/policies/items-ov.html