0-250 USD depending on condition.
Yes, they describe the various chokes.
Modified.
By opening up or constricting.
Chokes for shotguns shrink the bore's diameter to tighten the shot pattern and increase practical range.
they help with patterns of shot and accuracy of slugs
A good basic article on chokes http://www.ssaa.org.au/stories/shotguns-a-beginners-guide-to-shotgun-chokes.html
Try e-gunparts.com
Refers to the amount of constriction at the muzzle.
Herter's sold various maker's products with their name on them.
The double triggers and fixed chokes hurt resale some. $400 is realistic.
Yes chokes are designed to tighten shot patterns.
I paid 425 with the camo , the slugbarrel and chokes