I have what appears to be an unfired HK Fabarm Semi Auto Tactical Shotgun that I am trying to get an approximate value on. I cannot find any for sale anywhere nor any that have been sold within the past 3-4 years. It is in the original HK hard case and has the door breacher muzzle break with it as well as the original manual. Does anyone have an idea of what I might be able to sell this for? I would appreciate the assistance.