Many of the adjustable chokes are adjusted by turning the choke. (If it does not turn with moderate hand force, it is probably gunked up with carbon- let soak in a good powder solvent for a day or two and try again). They work by squeezing movable strip closer together, or further apart- the tighter the squeeze, the tighter the choke. A tighter choke holds the shot column together longer, and gives a smaller pattern that has greater range.
Approximate value on this shotgun is $130 - $200 depending on condition.
You don't give us the model, so it is hard to answer the question. Assuming the gun does not have an obvious adjustable choke, the choke is probably not easily adjustable. A gunsmith can open the choke (from Full to Modified for example) or can install internal interchangeable choke tubes (costs around $125).
Some bolt action shotguns had an adjustable choke, and it is generally NOT recommended that slugs be fired through those. If there is no adjustable choke at the muzzle, your shotgun should be fine. Stay with rifled slugs.
Yes- that is what the poly-choke is for.
C-lect choke is an adjustable choke system that Mossberg implemented on their shotguns pre-1977. After 1977 they went to the accu-choke system. The choke is adjustable between Full, Modified, and Improved Cylinder. It is, however, not recommended for use with steel shot.
depends on the game you are hunting
I have a sears and robuck 20 ga. pump with adjustable choke on the end of the barrel
Yes
Shotgun with a skeet choke.
The Super choke is adjustable to allow the shooter the ability to shoot with an improved cylinder choke all the way to a full choke. A choke is a reduction in width of the barrel at the muzzle of the shotgun. This affects the rate at which the pellets spread after being fired. An improved cylinder choke is a slight adjustment so that the pellets will spread out like an ice cream cone shape while a full choke sends the pellets out with much less spread. This affects range and accuracy of the shot at various distances. The use is to be able to set the desired choke before taking a shot. A shotgun with a single choke setting cannot be adjusted by the user.
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.
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.