No. Many manufacturers have used Browning's patents. Your gun was made by Savage/Stevens. sales@countrygunsmith.net
You will have to call Browning to find out.
You will have to ask Browning.
This is a double barrel, over/under shotgun.
Magnum
The Dictionary says: "to place above or upon something else, or one upon another." As in the case of the Browning shotgun, the Superposed model ws the first sucessful Over/Under shotgun ever made. Browning used the dictionary description to name the model "Superposed" because one barrel is apon another.
Modified Choke
Long Tang Flat Knob
It stands for Modified choke.
It is the model name of the first Over/under shotgun that Browning made. "Superposed" in the dictionary means "one on top or over another".
If you mean a choke bored barrel, it designates the amount of constriction a shotgun barrel has.
Library.