How do you find information on a model 100 slug barrel single shot 12-gauge shotgun?
Model types can change depending on the manufacture of the firearm. The question was originally placed in Western Field. Assuming this is who the gun was made by, it may have been made for Savage or Western Auto. To get find out more, you will need to gather some more information from your piece. Some places you may want to check are Modern Gun Values or Gun Trader.
There is no "break in" shotgun. A "break open" shotgun is a single barrel, double barrel, or combination rifle/shotgun which breaks open in the sense that a lever will unlock the action, allowing the barrel to pivot at a hinge at the front of the receiver, pivoting the rear of the barrel up to expose the chamber. A shells may be loaded into the chamber and the barrel pivoted back to close the action. The…
In order to answer your question correctly,I would need the maker of the shotgun,shotgun model,and type of shotgun we are talking about(pump action,single shot,semi-auto etc.) I would also need to know what type of barrel you have(plain barrel,solid matte rib,or vent rib barrel).also include the overall condition of your shotgun and amount of blueing remaining on the receiver and barrel.