Whichever one you pull the trigger to.
You can select which barrel fires first.
This is a double barrel, over/under shotgun.
The wooden piece under the barrel of a breech-loaded shotgun is called the forend or forearm. It serves to protect the shooter's hand from the heat of the barrel during firing and provides a secure grip for handling the shotgun. The forend can come in various shapes and styles, often reflecting the design and aesthetics of the shotgun.
Check the receiver, barrel(s), under the barrel(s), under butt place.
proof mark
A weapon that has one shotgun barrel and one rifle barrel either in an over/under or side by side configuration.
You may have to break the shotgun down in to the barrel section and the receiver section first.Look under the barrel section on the flat just ahead of the lug for the serial number.
Best left to a gunsmith.
Single barrel, under $100. Double-barrel up to $200 unless heavily ornamented.
No way to answer without knowing barrel length and gauge.
Under $200.
Nothing without you providing a detailed description of your shotgun,to include the model,serial number to age your shotgun and what type of barrel it has(single,double,over under etc.)also include if it is a plain barrel,solid matte rib,or vent rib barrel.