from smallest pattern to largest: full improved modified modified improved cylinder cylinder (no 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.
It is called "choke". lcj
Choke.
It is called "choke". lcj
A barrel with a full choke.
Cylinder bore- no choke at all.
Usually modified, but each shotgun may be a bit different.
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
A shotgun barrel with a cylinder bore choke.
Yes- that is what the poly-choke is for.
No