Final answer:
The type of shotgun choke that produces the tightest pattern is the Full choke.
Step-by-step explanation:
The type of shotgun choke that produces the tightest or smallest pattern at a given distance is the Full choke.
A shotgun choke is a restriction in the barrel that controls and constricts the spread of the shot pellets as they leave the barrel. Different chokes are used to achieve different patterns at various distances. A Full choke typically provides the tightest pattern, as it constricts the shot the most.
For example, if you are shooting at a target 40 yards away and desire a tighter pattern for better accuracy, using a Full choke would be the best option.