I had to go look at my Quest 1000x and could not find any hole in the sight, but my Quest is about 4 years old and Crosman may have added it to yours. Usually a sight with a small hole is called a peep sight. I have a notch sight on my rifle. The only other hole on top of the rifle is towards the back of the barrel and that is a Scope stop. Some scopes have a pin on the bottom pf the scope mount to place in the hole, this keeps the scope from moving when the rifle fires.
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