All choke tubes are essentialy the same no matter the manufacturer. They are all screwed in at the muzzle. Each Firearm Manufacturer produced a tool, such as a T-Wrench or a hand held clutch of some sort to fit the slots to turn the choke (like a big screwdriver). Some choke tubes are exposed on the end and can be turned by hand. If your's is recessed, it is better to find the tool to change choke rather than damage the choke by using another metal object to change it.
Tubes that constrict the column of shotgun pellets as they exit the barrel
For the Stoeger side-by-side shotgun, your best bet would be to use any of the standard Winchester choke tubes. They should fit well for you shotgun.
The Brazilian CBC Model 586 shotgun typically uses Beretta/Benelli Mobil choke tubes, which are also known as the Maxis chokes. You can use choke tubes compatible with this system in your CBC Model 586 shotgun.
# They relate to choke type, i.e., full, modified....
System of changable shotgun choke tubes made by Mossberg. Accu Choke is their brand name. A shotgun choke is a means of reducing the bore size at the muzzle of a shotgun, to produce shot patterns that spread to a greater or lesser degree.
Not recommended
The shotgun in question uses a standard Tru-Choke.
If it has choke tubes, yes. If it is fixed choke, no. I called Browning about mine and that was the answer they gave me.
Rem-Choke
Change the barrel unless it has removeable choke tubes. In that case, change the tube.
What gauge and grade is it?
A pattern of a shotgun is determined by the choke at the factory. Some models have a variable choke that makes the user able to change the pattern.