Unscrew the current choke and screw in the required choke. Making sure to clean the threads before hand.
Both shotguns and cars have chokes. How they are adjusted depends of the particular shotgun or engine- we need more info to give you a real answer.
There is no choke to adjust.
A barrel with a full choke.
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.
Cylinder bore- no choke at all.
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.
They came in various barrel lengths and choke combinations. If it is not marked on the side of the barrel, you will have to pattern the shotgun to determine the choke
To remove the barrel choke on a Mossberg 600AT shotgun, first ensure the shotgun is unloaded and clear. Use a choke wrench or a suitable tool to unscrew the choke from the barrel’s muzzle. Turn it counterclockwise until it is completely free. Once removed, you can replace it with a different choke or leave it as is, depending on your preference.
A shotgun barrel with a cylinder bore choke.
Yes- that is what the poly-choke is for.
No
To focus the pattern of shot.