With removeable chokes, it's simple, replace the tube. Otherwise you have to find a really good gunmsith.
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.
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 poly choke is an adjustable shotgun choke that allows the shooter to modify the spread of shot from a shotgun shell. It consists of a tapered sleeve that can be rotated to change the constriction and, consequently, the pattern of the shot as it exits the barrel. This versatility enables shooters to adapt to different shooting situations, such as hunting or sport shooting, without needing to change the choke tube. Poly chokes are often favored for their convenience and ease of use.
The Savage Super Choke was introduced in the early 1970s as a feature for some of Savage Arms' shotguns. This choke system was designed to enhance shotgun performance by allowing shooters to easily change choke tubes for different shooting conditions.
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
A shotgun barrel with a cylinder bore choke.
No
To focus the pattern of shot.
Yes- that is what the poly-choke is for.
A poly choke is an aftermarket choke. The choke twists to different settings. It should have marks to determine settings around the collar of the choke