More pieces of the puzzle...thanks. The Gmos is followed by 850kgs. For Hammergun: What in the description makes you think Gorosabel? Have you seen any pics that I can compare to? Did the PG in front of the serial number give it away? Maybe the PG is the missing "makers mark". It is tight and lever is still a right of center. Can you shoot steel shot through it for waterfowl hunting?