Which of the following is NOT one of the most common shotgun chokes?

The correct answer points to the fact that extended choke tubes are not classified as one of the most common shotgun chokes. Standard shotgun chokes, like cylinder, improved cylinder, and modified, are widely used and recognized for their specific patterns and intended purposes when shooting.

The cylinder choke allows for the most open pattern, providing a wide spread of shot at short ranges. The improved cylinder choke offers a slightly tighter pattern, making it versatile for various situations. The modified choke is tighter still, allowing for effective shooting at medium ranges.

On the other hand, extended chokes are accessory tubes that can be added to standard chokes to reach further distances or create specialized shot patterns, but they aren't considered one of the fundamental choke types. Thus, they stand apart from the most common types, which form the basis of shotgun choke knowledge for hunters and shooters alike.